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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.