Grace pushes her foot against the wall with a force of 35 N while she stands

on a skateboard. Her mass, including the skateboard, is 55 kg. What is her

rate of acceleration?

A. 1.6 m/s2

B. 0.64 m/s2

C. 90 m/s2

D. 20 m/s

The correct answer is B. 0.64 m/s²

Explanation:

According to the Newton's Second law of motion acceleration of an object by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force.

Mathematically,

F ∝ a

F = ma

Given dа ta:

Force = F = 35 N

Mass = m = 55 kg

acceleration = a = ?

F = ma

a = F/m

a = 35/55

a = 0.64 m/s²