Answer to Question #297579 in Physics for Crieza

Question

A 10 KG BLOCK LIES ON A FRICTIONLESS HORIZONTAL SURFACE.

A. WHAT FORCE WILL GIVE IT AN ACCELERATION OF 500 CM/S2 ?

B. WHAT CONSTANT FORCE WILL GIVE THE SAME BODY A VELOCITY OF 2 M/S AFTER 1 S ?

Answer 1

Given:

$m=10\:\rm kg$

$a=500\:\rm cm/s^2=5\: m/s^2$

$\Delta v=2\:\rm m/s$

$\Delta t=1\: \rm s$

(a) the Newton's second law says

$$F=ma=10*5=50\:\rm N$$

(b)

$$F=ma=m\frac{\Delta v}{\Delta t}=10*\frac{2}{1}=20\:\rm N$$