1. Convert the following: a. 15.0 kg to N
b. 85.0 N to kg
c. 220 lb to N
d. 550 N to lb.
2. What force is needed to accelerate the stone of
mass 25.0 kg upward at 5.00 m/s2?
Draw a free body diagram.

3. A rocket that weighs 7850 N on the earth is fired.
The force of propulsion is 1.04 x 104 N.
a. Find the mass of the rocket.
b. The acceleration of the rocket
c. The velocity of the rocket at the end of 10.0 s.
d. The displacement at the end of the above time
frame ( 10.0 s)
4. A force of 15.0 N is necessary to keep the 4.0 kg
wooden block moving along a table top at a uniform
velocity . Calculate the co-efficient of friction.
5. A car moving on a high way has a mass of 400 kg.
The coefficient of friction between the tire and the
car is 0.2. What acceleration will a force of 2500 N
produce on the car?