A block of mass starts from rest on a frictionless horizontal surface and is pushed…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A block of mass

m

starts from rest on a frictionless horizontal surface and is pushed by a constant horizontal force of magnitude

F

for a time

t

. Which of the following best describes how the instantaneous power

P

delivered by the force depends on

t

? (a)

P

is constant in time. (b)

P

increases linearly with

t

. (c)

P

decreases inversely with

t

. (d)

P

increases proportionally to

t^{2}