Question

A heavy box is slid across across a rough floor ith an initial speed 4m/s it stops moving after 8secs if the average resisiting force of friction is 10 n, the mass of the box is

Answer 1

$\large{\boxed{\textbf{YOUR ANSWER \:}}}$

u=4m/s

t=8s

v=0

As we know

v =u+at

0=4+8a

$a= \frac{1}{2} m/ {s}^{2} ............(1)$

Now F=ma

We will take F as frictional force

10=m x 1/2

m=20kg

$\large{\boxed{\bold{m = 20 kg \:}}}$