A block of mass 0.5kg is initially at rest on the ground. You then exert a...
A block of mass 0.5kg is initially at rest on the ground. You then exert a constant force of magnitude 30N straight up on the block. What is the box’s kinetic energy when you have lifted it 1m?
A) 35J B) 30J
C) 25J D) 20J
E) 5J
Homework Answers
from the work energy theorem
change in kinetic energy = force * displacement
where force = 30 N and
displacement = 1m
box’s kinetic energy is 30 N * 1 m = 30 joules
hence option ( B ) correct
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