How much force must be applied by a golf club to give a stationary 90 gram ball an acceleration of 40 meters per second?
Force= mass x acceleration, first convert the 90g into kg
because that is the SI unit of mass. so 90g = .09kg
F= 0.09kg x 40m/s
= 3.6 Newtons and to 1 significant digit its 4 newtons