A 75 kg skateboarder is initially going 5 m/s to the right. He slows to a stop over 10 seconds. What is the direction and magnitude of the net force that causes this change?

F = 37.5 N (Towards left)

Explanation:

Given that

m = 75 kg

initial velocity, u = 5 m/s (towards right)

The final speed, v = 0 (takes 10 s)

We know that

v = u + a t

a=acceleration

t=time

0 = 5 + a x 10

a = - 0.5 m/s²

We know that force F

F = m a

F = 75 x (-0.5) N

F = - 37.5 N

Negative sign indicates that force will act opposite to the direction of motion. We can say that force act towards left side.

Magnitude of force, F = 37.5 N (Towards left)