A boy weighing 50 kg finished long jump at a distance of 8 m . Considering that he moved along a parabolic path and his angle of jump is 45^ , his initial K E is

Step-by-step solution

R =8 ~m , =45^ aligned & R= u^2 2 g = u^2 90^ g = u^2 9.8 & u^2=9.8 R=9.8 8=78.4 aligned Initial K.E. of the man, ( K . E )₂= 1 2 mu ^2= 1 2 50 78.4=1960 ~J