Amotorcycle 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