Answer to Question #59417 in Mechanics | Relativity for muhammad umar

Question

A uniform plank AB 30 m long, weighing 100 N is pivoted at point P,Q which are 5 m from the ends A and B respectively.A boy of weight 250 N stand at apoint D on the plank,1 m away from Q and the arrangement is in equilibrium.Determine the reaction R1 and R2 at the supports ?

a)77.5 N, 245.5 N

b)105.5 N 33.5 N

c)37.5 N, 312.5 N

d)27.5 N, 232.5 N