<span>You want to focus on the car's acceleration.
(Hope this helps you! :) Have a nice day!)</span>
Speed is the distance travelled by an object whereas velocity is distance travelled by an object per unit time in a given direction.
<span>gravitational force = 0.1 mg-wt. = 0.1 * 10^-6 * 9.8 N = Gm1m2/r^2
m1 = 40 kg m2 =15 kg and r = 0.2 m
Put in and find G</span>
