A football player takes a spot kick. He kicks the ball of mass 20g with a force of 50N. If the ball moves off with a velocity of 20m/s, calculate the time of impact with the ball.

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12-08-2024
Physics

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A football player takes a spot kick. He kicks the ball of mass 20g with a force of 50N. If the ball moves off with a velocity of 20m/s, calculate the time of impact with the ball.

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MathPhysidn MathPhysidn · Answer 1 · 2024-08-12T09:47:17-04:00

MathPhysidn MathPhysidn

12-08-2024

Answer:

0.008 s

Explanation:

Impulse (J) is equal to change in momentum (Δp), where momentum is mass (m) times velocity (v). Impulse is also equal to the average force (F) times the change in time (Δt).

J = J

Δp = FΔt

mΔv = FΔt

(0.020 kg) (20 m/s) = (50 N) Δt

Δt = 0.008 s

The time of impact is 0.008 seconds, or 8 ms.

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