How much work is required to increase the kinetic energy of a motor scooter by 4000 J?

What is the average power needed to move a 1000 kg car from rest in 7 seconds at a rate of 4 m/s^2?

A 1650 kg is traveling at 37.0 m/s. How fat must a 91.0 kg bicycle and rider be traveling to have the same kinetic energy as the car ?

A dog races up the stairs in a time of 1.80 seconds.  If the stairs are 12 feet high, how much power in hp is the dog putting out?  The weight of the dog is 48 lbs.

the kinetic energy of a car is 7 x 10^6 J AS IT TRAVELS along a horizontal road. How much work is required to stop the car in 15s?

A 1000 kg sports car accelerates from 0 to 30 m/s in 10 s. What is the average power of the engine?

A 2,000-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 3.00 m before coming into contact with the top of the beam, and it drives the beam 14.6 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.

A 35.0 kg crate sits on a conveyor belt with s = 0.870. The conveyor belt starts at rest.Once it is turned on, the crate (which follows the belt, so that it stays at rest with respect to thebelt) speeds up to 2.30 m/s in a uniform fashion. How much power does the motor use to turnthe conveyor belt?

The energy needed to increase the speed of a certain car from 22 m/s to 44 m/s is 240 kJ. At what speed is the car is kinetic energy equal to 240 kJ? 

How much power is needed to accelerate a 1250 kg sports car from rest to 25 m/s in 4.5 seconds?