A frictionless wagon is pushed from rest, with a force 60 newtons for 14 seconds. If it then strikes a wall comes to rest in 0.15 second, how much average force of the wall exert on it?
(a) 6000 N                  (b) 5600 N                 (c) 4500 N                    (d) 4000 N

Dear student,
Here is the solution of your asked query:
Q.15. Here, the following condition must be applied
Impulse that puts the wagon in motion=Impulse that stops the wagon
60 x 14=F x 0.15
or F=(60 x 14)/0.15
=5600 N
Thus, the average force that the wall exert on the wagon is 5600 N.

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