Answer:
Explanation:
F = ma
m = F/a
10/2.5 = 4 kg
12/3 = 4 kg
22/5.5 = 4 kg
Newton's first law says that a body at rest will stay at rest and a body in motion in a straight line will continue along that straight line at the same speed unless acted upon by an external force. If the car has motion but no friction (an external force) in a reference frame, it will never stop relative to that frame.
