Question

A 2kg ball moves to the left at 20 m/s. How much work must be done...

A 2kg ball moves to the left at 20 m/s. How much work must be done to cause the ball to move to the right at 25 m/s?

25 J

225 J

625 J

1025 J
Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Kinetic energy of the ball when towards left

Kinetic energy of the ball when moving towards right

By Work-Energy theorem, the net workdone on the body is equal to the  change in Kinetic energy of the body.

Therefore, workdone to cause the ball to move towards right at 25 m/s is

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
You throw a ball, m = 2kg, with an initial velocity of 20 m/s at an...
You throw a ball, m = 2kg, with an initial velocity of 20 m/s at an angle of 60 degrees from the top of a 30 m cliff? a. using energy considerations, what is the magnitude of the velocity when it hits the ground? b. what is the total mechanical energy in this system? c. what if I change the angle to 50 degrees; does this change your answers?
10. How much work is done when a ping pong ball of mass .40 kg speeds...
10. How much work is done when a ping pong ball of mass .40 kg speeds up from 6 m/s to 10 m/s in 45 seconds and travels 14 km? a) 5 x 10-2 J b) 5 x 102 J c) 5 x 10-4 J d) 5 x 104 J 11. Convert 4π/3 radians to degrees. ___________________________. 12. A physics textbook is dropped from 20 m and has a mass of 14 kg. What is its kinetic energy 5/9 of...
How much work W must be done on a particle with a mass of m to...
How much work W must be done on a particle with a mass of m to accelerate it from a speed of 0.891 c to a speed of 0.989 c ? Express your answer as a multiple of mc2 to three significant figures. I keep getting 4.87 as the answer but it says it is wrong.
A 0.10 kg ball A moves to the right at 0.35 m/s and collides elastically and...
A 0.10 kg ball A moves to the right at 0.35 m/s and collides elastically and perfectly head on with the 0.30 kg ball B that moves to the rigth at 0.050 m/s. The velocity of ball A after the callision is?
A 2.2 kg ball moves to the right with a speed of 6.5 m/s and collides...
A 2.2 kg ball moves to the right with a speed of 6.5 m/s and collides with a 1.8 kg ball moving at 1.8 m/s in the opposite direction. If this is a completely elastic collision determine the velocity of each ball.
A factory worker moves a 21.0 kg crate a distance of 4.80 m along a level...
A factory worker moves a 21.0 kg crate a distance of 4.80 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.300. What magnitude of force must the worker apply? (N) How much work is done on the crate by the worker's push? (J) How much work is done on the crate by friction? (J) How much work is done by the normal force?...
How much heat must be removed to make ice at -10 degrees C from 2kg of...
How much heat must be removed to make ice at -10 degrees C from 2kg of water at 20 degrees C (The latent heat of fusion for water is.25X10^5 J/kg. The specific heat of water is 4190 J/kg K and for ice is 2090 J/kg K.) a. 7.95 X10^5 b. 8.37 X10^5 c.8.75 X10^5 d. 2.09x10^5
How much work must be done on an electron to accelerate it from rest to a...
How much work must be done on an electron to accelerate it from rest to a speed of 0.989c?
How much work must be done on an electron to accelerate it from rest to a...
How much work must be done on an electron to accelerate it from rest to a speed of 0.963c?
11 of 12 Constants | Periodic Table Part A How much work is done by the...
11 of 12 Constants | Periodic Table Part A How much work is done by the horizontal force FP = 150 N on the 18-kg block of the figure(Figure 1) when the force pushes the block 5.0 m up along the 32 ? frictionless incline? Express your answer using two significant figures. Wp =   J   SubmitRequest Answer Part B How much work is done by the gravitational force on the block during this displacement? Express your answer using two significant...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT