Question

boy weighing 50kg finished long jump at a distance of 8 metre considering that he moved along a parabolic path and his angle of jump is angle of 45° his initial kinetic energy will be​

Answer 1

Answer:

Range = 8 m

or, (u^2)Sin(2×45°)÷2g = 8

or, u^2 = 8×2×10 m^2/s^2 = 160 m^2/s^2

Thus,

Initial K.E.

= m(u^2)/2

= 50×160÷2 = 4000 J (ANSWER)