Acar starts from rest at a stop light and reaches 20 m/s in 3.5 s. determine the acceleration of the car.
a) 3.5 m
s2

b) 5.7 m
s2

c) 20 m
s2

d) 70 m
s2

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

What object a collides with object b and bounces back its final momentum is?

The necleus of an atom is made up of what subatomic particles?