brakes of your bicycle have failed, and you must choose between slamming into either a The rack or a concrete wall. Which one of the following statements best justifies why hitting a stack is a wiser choice than hitting a concrete wall? a) The haystack gives you a smaller impulse than the concrete wall. b) The haystack changes your momentum over a longer time c) Your change in kinetic energy is smaller if you hit the haystack than if you hit t concrete wall d) Your change in momentum is smaller if you hit the haystack than if you hit the concrete e) More potential energy is stored in the wall which is released upon the impact and results in a greater force on you

Question

Physics

Guest

27 November, 11:20

brakes of your bicycle have failed, and you must choose between slamming into either a The rack or a concrete wall. Which one of the following statements best justifies why hitting a stack is a wiser choice than hitting a concrete wall? a) The haystack gives you a smaller impulse than the concrete wall. b) The haystack changes your momentum over a longer time c) Your change in kinetic energy is smaller if you hit the haystack than if you hit t concrete wall d) Your change in momentum is smaller if you hit the haystack than if you hit the concrete e) More potential energy is stored in the wall which is released upon the impact and results in a greater force on you

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Answers (1)

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Nixon · Answer 1

b) The haystack changes your momentum over a longer time

because:

We know that,

impulse = force x t = m (v2 - v1)

f = m (v2 - v1) / t

force will be less and u will likely to be safe. Momentum change will be the same in both the cases.