On a wall we attach a spring of length 0.15 m of spring constant k= 4 N/m. We compress the spring with a ball of mass, m=0.25 Kg, the spring is compressed fully, and calculate the spring force on the ball. After a while, we release the ball and the spring pushes the ball forward towards the right. Calculate the acceleration of the ball as soon as it leaves the spring, assume that the floor is frictionless. Now consider another case where friction was present and the coefficient of friction of the floor was 0.2. Now calculate the acceleration of the ball as soon as it leaves the spring.

1) Calculate the spring force on the ball

2) Calculate the acceleration of the ball when friction is absent

3) Calculate the acceleration of the ball when friction is present