A man having the mass of 75 kg sits in the chair which is pin-connected to the frame BC....

A man having the mass of 75 kg sits in the chair which is pin-connected to the frame BC. If the man is always seated in an upright position, determine the horizontal and vertical reactions of the chair on the man at the instant θ = 45°. At this instant he has a speed of 6 m/s, which is increasing at 0.5 m/s2.