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4. A box with a mass of 70 kg is placed on a horizontal
floor with a smooth surface. The velocity of the box
changes from stationary to 50 m/s in 10 seconds when it
is acted on by a force. Find the magnitude of the force.
5. What force will produce an acceleration of 7 m/s in a
-2
body of 10 kg?
6. Calculate the mass of a body when a force of 225 N
-2
produces an acceleration of 2.5 m/s .
7. What is the acceleration produced by a force of 10 N
acting on a body of mass 200g?
