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IGCSE Physics Solved Multiple Choice Questions- Resultant Force

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A ball of mass 0.12 kg is hit by a tennis player. The velocity of the ball changes from 0 m / s to 5.0 m / s in 0.60 s. What is the average resultant force acting on the ball while it is being hit?

A 1.0 N

B 2.5 N

C 3.6 N

D 8.3 N

Worked Solution

Given:

  • Mass of ball, m = 0.12 kg
  • Initial velocity, u = 0 m/s
  • Final velocity, v = 5.0 m/s
  • Time taken, t = 0.60 s

Step 1: Calculate acceleration

a= (v-u)/t= (5-0)/0.6= 8.33 m/s2

Step 2: Find average force

F=ma= 0.12 x 8.33=0.96N

? Correct Answer: A (1.0 N)

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