A motorcycle being driven on a dirt path hits a
rock. Its 60.-kilogram cyclist is projected over
the handlebars at 20. meters per second into a
haystack. If the cyclist is brought to rest in
0.50 second, the magnitude of the average force
exerted on the cyclist by the haystack is
(1) 6.0 * 10^1 N (3) 1.2 * 10^3 N
(2) 5.9 * 10^2 N (4) 2.4 * 10^3 N
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