Answer:
F = 64 N
Step-by-step explanation:
Given that,
Mass of the shopping cart, m = 8 kg
Initial speed of the shopping cart, u = 0
Final speed of the shopping cart, v = 4 m/s
Time, t = 0.5 s
We need to find the magnitude of the force that causes the shopping cart to accelerate. The force is given by the formula as follows :

So, the magnitude of force is 64 N.