A 430-g soccer ball lying on the ground is kicked with a force of 800 N.If the kick lasts 0.01 s, the ball flies off with a speed of
A)0.0186 m/s.
B)0.182 m/s.
C)1.90 m/s.
D)18.6 m/s.

Question

Quizplus · Accepted Answer

The impulse imparted to the ball is equal to the change in momentum. Impulse = Force × time = 800 N × 0.01 s = 8 Ns. The change in momentum is equal to the mass of the ball times its change in velocity. Therefore, 8 Ns = 0.43 kg × velocity. Solving for velocity gives velocity = 8 / 0.43 ≈ 18.6 m/s.

A 430-G Soccer Ball Lying on the Ground Is Kicked