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1.Heather can apply a force of 72 N to a wagon in which sits her little brother, Bryce. The combined mass of Bryce and the wagon is 48 kg. If starting from rest, how much speed will the wagon pick up after Heather has pushed the wagon for 3s?

2.When the wagon in the previous problem reaches a speed of 8 m/s, Heather lets go and Bryce puts on the brakes. If the wagon comes to rest 6s later, how much force did the breaks apply?

for 1 i thought you had to first convert bryce's mass into Newtons, so i did 48kg/10 and i got 4.8 N is the weight of the wagon and Bryce. But after that i got lost. Do i have to find a resultant force? I really have no clue what to do in these problems besides what i just told u