Average force from impulse
A 0.5 kg ball moving at 20 m/s is caught and stopped in 0.01 s. What average force does the glove exert?
Answer C: explanation for every choice
A
10 kg·m/s is the change in momentum, not the force.
B
This uses 0.1 s instead of 0.01 s.
C
Correct. F = Δp/Δt = (0.5 × 20)/0.01 = 1,000 N.
D
This assumes the ball bounces back at 20 m/s, doubling Δp.
TakeawayFavg = Δp/Δt.
Equation usedMomentum and impulse
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