Two objects attract each other with a gravitational force of 25 newton’s from the given distance. if the distance between the two objects is reduced by a factor of 5, what is the changed force of attraction between them?

The changed force of attraction between them is 625 newtons.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -