a net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of

force = change in momentum/change in time or m A if m is constant

change in momentum/3 = 200

change in momentum = 3*200 kg m/s

To calculate the change in momentum of the wagon, we need to use the formula:

Change in momentum = Net force x Time

In this case, the net force applied to the wagon is 200 Newtons and the time is 3 seconds. Therefore, the change in momentum can be calculated as follows:

Change in momentum = 200 N x 3 s
Change in momentum = 600 Ns (Newton-seconds)

So, the wagon undergoes a change in momentum of 600 Newton-seconds.