A boy falls off his bike and hits his head (5 kg) on the pavement. The velocity of his fall at the time of impact is 5 m/s. (p = m v) The helmet slowed the impact to 0.001 s. What is the force felt on the boy's brain due to his fall?
(F Δt = m Δv => F = (m Δv)/Δt )

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If the boy in problem 5 had not been wearing his helmet, how much force would have been applied to his brain during the collision? (Δt = 0.000001 s without a helmet. )