A 45 g golf ball at rest is struck by a club and starts moving at 25.9 m/s. What is the average force if the club and ball are in contact for 1.6 s?

Acceleration is defined as the rate of change of velocity.
Force is the product of mass and acceleration.

The golf
ball has a mass of 45 g. It is initially at rest and starts to move at a velocity of
25.9 m/s when it is struck with the golf club. When the golf club strikes the ball they
are in contact with each other for 1.6 s.

The acceleration
of the ball is given as: (25.9 - 0)/1.6 = 16.1875
m/s^2.

The average force applied by the club that results
in the acceleration equal to mass*acceleration or (45/1000)*16.1875 = 0.7284
N.

The average force applied by the club while it strikes
the ball is equal to 0.7284N.