Question

At a given instant in time, a 18-kg rock is observed to be falling with an acceleration of 7.75 m/s2. What is the magnitude and direction of the gravitational force on the rock?

Answer 1

36.9 N

Step-by-step explanation:

m = 18 kg

a = 7.75 m/s^2

g = 9.8 m/s^2

F = mg - ma = 18 (9.8 - 7.75)

F = 18 x 2.05 = 36.9 N

The gravitational force acting on the rock is 36.9 N.