Question

A body is moving with the speed 20 mis on a mo
surface. If coefficient of friction is 0.5, then in
distance after which velocity becomes zero is
(1) 10 m
(2) 20 m
(3) 40 m
(4) 80 m
plz ans. fast ​

Answer 1

Answer:

3) 40m

Explanation:

u= 20m/s, v = 0 m/s , s = ?

a = mu*g  ( mu = coefficent of friction =0.5)

a = 0.5*10 = 5 m/s2

now apply the formula

v^2 = u^2 + 2as

(0)^2= (20)^2 + 2 *5*s

on  solving s= 40 m