A skier of mass 60 kg pushes off the top of a bull with an initial sapwood of 8.

Question

A skier of mass 60 kg pushes off the top of a bull with an initial sapwood of 8.5 m/s How fast will she be moving after dropping 10 m elevation? A mechanic pushes a 3.4 times 10^3 kg car from rest to a speed of v, doing 4750 J of work in the process. During this time, the car moves 29.0 m. Neglecting friction between car and road, find the speed of the car? A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker what net work is done on the wheelbarrow?

Explanation / Answer

8.

by conservation of energy

(1/2)mVi2+mgh=(1/2)mVf2

(1/2)*60*8.52+60*9.8*10=(1/2)*60*Vf2

Vf=16.38 m/s

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