While sitting on a perfectly slick, frictionless surface, a 60kg person accelerated an 10 kg medicine ball at 4 m/s ^2 away from himself. What acceleration did the person have?

A 1500kg truck reached 40 m/s in 11s from rest. What force did the engine provide?

A bus with mass 7500kg applies its brakes and a negative force of 20000 N is applied. If the bus was traveling at 30 m/s, what was the stopping distance?
If the time in the question above was .06 s, what velocity would the person reach?

Please help me out!

Afaulty model rocket moves in the xy-plane (the positive y direction is vertically upward). the rocket's acceleration has components ax(t) = ? t2 and ay(t) = ? ? ? t, where ? = 2.50 m/s4 , ? = 9.00 m/s2 , and ? = 1.40 m/s3 . at t = 0 the rocket is at the origin and has velocity ~v0 = v0x ? i + v0y ? j with v0x = 1.00 m/s and v0y = 7.00 m/s. (a) calculate the velocity and position vectors as functions of time. (b) what is the maximum height reached by the rocket? (c) sketch the path of the rocket. (d) what is the horizontal displacement of the rocket when it returns to y = 0?