A 3.90 x 10^3 kg truck is moving at 6.00 m/s. How much work must be done to bring it to a stop?

A 1.5 kg hockey puck initially moving at 4.9 m/s slides 12 m along the ice before coming to rest.  How much work is done by friction? Coefficient of friction is 0.1

1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?

An object is placed to a shelf from the ground which is 1.8 m higher. find out how much work is done by you. If the same object falls to the ground, how much work is done by gravity? Mass of the object is 200 g.

A bicyclist plus his bike weighs 80 kg. For the length of a 2-mile long hill, the bicyclist can do 250 W of useful work. How long will it take him to ride uphill given that the hill is inclined at 4 degrees?

A worker lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building. What is the minimum amount of work that the worker did in lifting the bucket? (A) 0.16 kJ (B) 0.40 kJ (C) 0.56 kJ (D) 3.92 kJ 400