Name:______________________ Score:
Regents Physics
Worksheet 3.2.2 – Work/Energy Principle (20 points)
Show all work – multiple choice answers MUST be proven for full credit!
20
1. A 5.0 kilogram block initially at rest is accelerated by a
force of 25 newtons such that it attains 5.0 x 102 joules of
kinetic energy.
a. Determine the final speed of the object.
[14 m/s]
b. Calculate the distance over which the object was
3. A 1.0 x 103 kilogram car moving east at 3.0 meters per
second is slowed by a 5.0 x 102 newton braking force
that is directed to the west and operates over a distance
of 4.0 meters.
a. Determine the initial kinetic energy of the car.
[4.5 x 103 J]
b. Calculate the amount of work done by the
braking force.
