Question

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?

Answer 1

F= 37.5 N ( Towards left)

Step-by-step 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)