Physics

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}