Physics Forces Question

Question

A 15kg cart is being pushed with a horizontal force of 120 N. If the cart starts at rest, can you help me find how fast is the cart moving after 4.0 seconds?

Answer 1

F net = ma

F net = 120 N

m = 15 kg

a = 120 / 15 = 8 m/s/s

v= u + at

u = 0 as cart started at rest

a = 8 m/s/s

t = 4 s

So v = 0 + 8x4 = 32 m/s

After 4 s , speed is 32 m/s