A 24.0 kg object is initially traveling at 3.50 m/s. Exactly one minute later the object is traveling at 18.40 m/s. How much total work was done on the object during this minute?

A force of 12 Ib is required to hold a spring stretched 2 in. beyond its natural length. How much work W is done in stretching it from its natural length to 6 in. beyond its natural length?

A typical muscle fiber is 2cm long and has a cross-section area of 3.1x10^-9m^2. When the muscle fiber is stimulated, it pulls with a force of 1.3mN. What is the work done by the muscle fiber as it contracts to a length of 1.4cm?

A child exerts a horizontal 15 N force on a 10 kg box to push it 7 m across a floor that has a coefficient of kinetic friction of 0.1 with the box.  (a) How much work does the child do on the box?  (b) How much work does gravity do on the box?  (c) How much work does the normal force do on the box?  (d) How much work does the force of kinetic friction do on the box?  (e)  What is the total work done on the box?  (f) How much kinetic energy has the box gained during this process?  (g)  If the box was initially at rest, then how fast is the box moving at the end of this process?

A 0.41-kg particle has a speed of 3.0 m/s at point A and kinetic energy of 8.0 J at point B. (a) What is its kinetic energy at A? (b) What is its speed at point B? m/s (c) What is the total work done on the particle as it moves from A to B? J

One of the most powerful forklifts was built in Sweden in 1991. The lift is capable of lifting a 9.0 x 1 04 kg mass a distance of 2.0 m above the ground. If the work done by the forklift on the mass is 1.8 x 1 06 J, what is the force that the lift exerts on the mass?

Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 3.0 kg pumpkin to a height of 1.3 m , then carry it 50.0 m (on level ground) to the check-out stand. Calculate the work you do on the pumpkin as you lift it from the ground. How much work do you do on the pumpkin as you carry it from the field?

A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?

A 1300kg truck travels up a 17.5m high hill. The nonconservative forces of friction and the force generated by the engine do work on the truck. If the work done by friction is -3.10x105j and the work done by the engine is 6.40x105j, determine the change in the trucks kinetic energy as it travels from the bottom to the top of the hill.

A force of 17 Ib is required to hold a spring stretched 3 in. beyond its natural length. How much work W is done in stretching it from its natural length to 9 in. beyond its natural length?