Problem 4. (20 points)

A constant horizontal force F = 300 N is applied to the linkage as shown. Assuming the 100 N

ball to be originally at rest with the angle = 60° as shown, calculate the velocity v of the ball

(15 points) and the force exerted by the rod on the ball (5 points) as approaches zero (where the

ball reaches its highest position). The spring of stiffness k = 50 N/m has an un-stretched length

of 1 m. Neglect the size of the ball,the thickness of the linkage,mass of the linkage, and treat this

as a particle dynamics problem.

1.0 m

1.0m

2.0 m

1.0 m