Askier of mass 70 kg is pulled up a slope by a motor-driven cable. the acceleration of gravity is 9.8 m/s 2 . how much work is required to pull him 62.5 m up a 38.4 ◦ slope (assumed to be frictionless) at a constant speed of 3.77 m/s.

26.65 kJ

Explanation:

Given

mass of skier=70 kg

length of ramp=62.5 m

slope

speed=3.77 m/s

so net force on skier must be zero

Net work done will be change in Potential energy of skier

Potential Energy

P.E.=26.65 kJ

you would expect a sound wave to speed up. - b)

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.