Consider the following information:

Newton’s second law is given by the equation:

 a = F/m

Where: 

  • a is the acceleration of an object in m/s2 
  • F is the force applied to the object, and
  • m is the mass of the object being accelerated in kilograms. 

Recall that acceleration is the rate of change of velocity of an object; that is, 

a = v/t

A soccer ball weighing 500 g is lying near the center line of the field. A player kicks it with a force of 400 N. What is the velocity of the ball after 5 seconds?

A. 4,000 m/s

Explanation

We have: a = F/m and a = v/t, so:

F/m = v/t → v = (400 N/0.5 kg) × 5 s = 4,000 m/s

Choice A is correct.

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