A constant
85
N force acts on a
5.00
kg box. The box initially is moving at 20 m/s in the
direction of the force, and 3.0 s seconds later the box is moving at
71
m/s. Determine both the
work done by this force and the average power delievered by the force during the 3.0second
interval.
By what factor does the kinetic energy of a car change when its speed is
quadrupled
?
Consider the following.
(a) Find the force
F
x
associated with the potentialenergy function
U
=
Ax
7
, where
A
is a constant.
(b) At what value(s) of
x
does the force equal zero?
A
4
kg object is given a displacement
s
=
1
m +
1
m 
1
m along a straight line. During the
displacement, a constant force
=
4
N 
4
N +
3
N acts on the object.
(a) Find the work done by
for this displacement.
(b) Find the component of
in the direction of the displacement.
Find the power input of a force
acting on a particle that moves with a velocity for each of the
following situations.
(a)
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 Spring '10
 KLARFELD
 Physics, Energy, Force, Kinetic Energy, Mass, Potential Energy, Work, Joule

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