A hill is 200 m long and makes an angle of 12° with the horizontal.As a 65-kg jogger runs up the hill,how much work does gravity do on the jogger?
A) 127,400 J
B) 26,488 J
C) −26,488 J
D) 124,616 J
E) zero

Question

A hill is 200 m long and makes an angle of 12° with the horizontal.As a 65-kg jogger runs up the hill,how much work does gravity do on the jogger?
A) 127,400 J
B) 26,488 J
C) −26,488 J
D) ​124,616 J
E) ​zero

Quizplus · Accepted Answer

Gravity only acts vertically downwards, whereas the hill makes an angle with the horizontal, which means that the force of gravity cannot be solely responsible for the motion of the jogger. Therefore, the work done by gravity would be zero (Option E).

A Hill Is 200 M Long and Makes an Angle