Answer to Question #296650 in Physics for Onin

Question

THE SPEED OF 5 KG BODY IS TO BE INCREASED FROM 10

M/S TO 20 M/S. WHAT CONSTANT FORCE IS NEEDED TO

PRODUCE THIS CHANGE IN SPEED IN EXACTLY 5 S ?

Answer 1

Given:

$m=5\:\rm kg$

$v_1=10\;\rm m/s$

$v_2=20\;\rm m/s$

$\Delta t=5\:\rm s$

The Newton's second law says

$F=ma=m\frac{\Delta v}{\Delta t}$

$F=5*\frac{20-10}{5}=10\:\rm N$