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The force vs time graphs for two collisions are shown

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The force vs time graphs for two collisions are shown. Which collision has the largest impulse? The impulses are the same. The impulse for collision 2 since it lasts longer. The impulse for collision 1 since it has the larger maximum force. Cannot be determined since the initial an final speeds are unknown. Cannot be determined since the masses are unknown.

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impulse is given as J= F.dt
incase of impulse 1
it is F(1-0.5) = 4*0.5 = 2Ns

in case of impulse 2 it is = 2(2.5-1.5) = 2 Ns

so
A ) Both the impulses are same