please show the work. Thanks. MULTIPLE CHOICE. choose the alternative that best

Question

please show the work. Thanks.

MULTIPLE CHOICE. choose the alternative that best completesthe statement or answers the question, one 2) A block of mass m on a horizontal frietionless surface with a speed 340 m/s. 2) 640 kg, moving makes a perfectly elastic collision with a block of mass M at rest. After the collision, the 640 block recoils with a speed of 0.400 m/s. In the figure, the blocks are in contact for 0.200 s. The magnitude of the average force on the 640-kg block, while the two blocks are in contact, is closest to After Before E) 185 N D) 168 N 160 N E) 122 N A) 176 N

Explanation / Answer

Let the average force of contact is F

now, using second law of motion

F = change in momentum / time

for 6.4 Kg block

F = 6.4 * (0.4 - ( - 3.40))/.2

F = 122 N

the force on the 6.4 Kg Block is B) 122N

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