Question

A ball of mass 0.1 kg, traveling at 4 m/s, hits a smooth billiard cushion normally and rebounds at 4 m/s. Calculate the force on impact if the time of impact is 0.1 s.

a) 0.4 N
b) 0.8 N
c) 1.2 N
d) 1.6 N

Answer 1

The force on impact can be calculated using the equation Force = (Change in momentum) / (Time of impact). Plugging in the given values, the answer is (b) 0.8 N.

Step-by-step explanation:

To calculate the force on impact, we can use the equation Force = (Change in momentum) / (Time of impact). We can calculate the change in momentum by subtracting the final momentum from the initial momentum. Since the mass of the ball doesn't change, we can simplify the equation to Force = (Mass x Change in velocity) / (Time of impact). Plugging in the given values, we get Force = (0.1 kg x 4 m/s - 0.1 kg x (-4 m/s)) / 0.1 s = 0.8 N. Therefore, the answer is (b) 0.8 N.