Question

1. A 25 kg skydiver has a speed of 20 m/s at an altitude of 350 m above the ground. Determine the kinetic energy possessed by the skydiver.

2. If a cruise ship travels 150 km to the south and then 250 km to the west, what is the ship’s displacement from its starting point?

3. A train is accelerating at a rate of 5 m/s . If its initial velocity is 15 m/s, what is its speed after 10
seconds?

4. A bowling ball weighs 49 N. What is its mass?

5. A force gives a 300 kg mass an acceleration of 3 m/s . What would be the acceleration if the same
force would give a mass of 200 kg?

6. What is the time needed for a car whose speed is 20 m/s to travel a distance of 100 m?

7. If 4900 joules of work is used to lift a 100 kg crate to a high shelf in a warehouse, how high was the crate lifted?

8. A tractor pulls a felled tree along the ground for a distance of 50 m. If the tractor exerts a force of 400 N, how much work will be done?

9. A bodybuilder lifted a barbell 5 m above the ground? If the barbell weighs 200 N, how much potential energy is gained holding the barbell in the air?

10. Rudy ran up the stairs, elevating his 50 kg body a vertical distance of 5 meters in a time of 4 seconds at a constant speed.
a) Determine the work done by Rudy in climbing the staircase.
b) Determine the power generated by Rudy.

Part II
1. A boat at anchor is rocked by waves whose crests are 10 m apart and whose speed is 20 m/s. How long does it take these waves to reach the boat?

2. A boat at anchor is rocked by waves whose crests are 20 m apart and whose speed is 4 m/s. At what frequency do these waves reach the boat?

3. Find the wavelength of a wave with a period of 10 s and a velocity of 30 m/s.

4. Waves in the open sea whose wavelength is 50 m and whose velocity is 35 m/s. What is the period of the waves?

5. Waves in the ocean have a period 20 s and a wavelength of 100 m. Find their velocity

Answer 1

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