Question

a block of 18kg is pushed along a horizontal frictionless surface by a horizontal force of 80N. the block start from rest. compute the kinetic energy after 6 seconds

Answer 1

$a=\frac Fm,$

$v=at=\frac{Ft}m,$

$E=\frac{mv^2}2=\frac{F^2t^2}{2m}=6.4~kJ.$