Question

Patrick weighs 375 N. He climbs a flight of stairs to a height of 4 m. It takes him 3 seconds.

How much work does Patrick do when he climbs the stairs?

A.
1500 J

B.
94 J

C.
125 J

D.
1125 J
Help!!!!!!!!!!!!!

Answer 1

It is A.



work = |force| * |distance| * cos(theta)

theta is the angle between the force and displacement vectors
this is a simpler case because theta = 0, and cos(0) = 1, bc our force is in the same direction as the displacement, upward

Patrick's work = | Patricks force to counteract his weight | * | distance ;he applies that force |
= (375 N) * (4 m)
= 1500 Nm = 1500 J