It takes 220 kJ of work to accelerate a car from 20.7 m/s to 27.5 m/s. What is t

Question

It takes 220 kJ of work to accelerate a car from 20.7 m/s to 27.5 m/s. What is the car's mass?

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 5.5× 104 kg, and the force causes its speed to change from 7500 to 5600m/s. (a) What is the work done by the force? (b) If the asteroid slows down over a distance of 2.2× 106 m determine the magnitude of the force.

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 80.6-kg water-skier has an initial speed of 6.2 m/s. Later, the speed increases to 11.5 m/s. Determine the work done by the net external force acting on the skier.

A 0.683-kg basketball is dropped out of a window that is 6.50 m above the ground. The ball is caught by a person whose hands are 1.70 m above the ground. (a) How much work is done on the ball by its weight? What is the gravitational potential energy of the basketball, relative to the ground, when it is (b) released and (c) caught? (d) What is the change (PEf - PE0) in the ball's gravitational potential energy?

The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 6.4 m/s. Neglect nonconservative forces, such as friction and air resistance, and find the height h of the highest point reached by the skateboarder on the right side of the ramp.

Explanation / Answer

answering nly first questio according to guide lines. eergy will be equal to the change in kinetic energy.

E=1/2m(vf^2-vi^2)

220=(0.5)(m)(27.5^2-20.5^2) hence the value of m is 1342 kg.

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