A 150-lb man leaps off the circular platform with a velocity of υm/p = 5 ft/s, relative to...

A 150-lb man leaps off the circular platform with a velocity of υm/p = 5 ft/s, relative to the platform. Determine the angular velocity of the platform afterwards. Initially the man and platform are at rest. The platform weighs 300 lb and can be treated as a uniform circular disk.