Question

a constant force acting on a body of mass of 5kg change its from 5m÷s to 10m÷s in 10s without changing the directon of motion. the force acting on the body is

Answer 1

F=5×(10_5)/10=2.5 newton

Answer 2

By using simple formulae
$f = \frac{m(v - u)}{t}$
F = 5×(10-5)/10
F= 5/2 = 2.5 newton

Hope it helps u