Question

A body of mass 2kg is thrown upward with inital velocity of 20m/s after 2second its kinetoc energy wil be

Answer 1

$v=u+(-g)t \\v=20+(-9.8)2\\v=0.4\\KE=mv^{2}/2 \\KE=2(0.4 )^{2}/2\\ KE=(0.4)^2\\KE=0.16J$