Question

Solve using basic kinematics equations, thank you!

5. A red paint ball fired from a 12-inch barrel will accelerate at 90,000 ft/s2. If the paintball is in the barrel for .004714 seconds, what is the muzzle velocity of the paintball? (The speed at which it leaves the barrel)

6. Motorcycles are some of the fastest decelerating vehicles. Some can slow down with an acceleration of 5g’s (g is the acceleration due to gravity, -9.81 m/s2 or –32.2 ft/s2). How much time does it take these super bikes to come to a panic stop from 60 miles/hour?

7. A police car traveling along the thruway suddenly accelerates at 5 ft/s2 for 4 seconds. If the police car reaches a speed of 90 miles/hour, how fast was it originally traveling when it started to accelerate?

8. What is the acceleration of a airplane in ft/s2 if it lands on a runway traveling at 300 mi/hour and 7 seconds later has slowed to 100 miles/hour?

Answer 1

Please see image and try to understand thanks

Also check calculations