Question

10. The coefficient of friction between the tyres and road is 0.4.
The minimum distance covered before attaining a speed of
8 ms starting from rest is nearly (take, g = 10 ms
(a) 8 m
(b) 4 m
(c) 10 m
(d) 16 m​

Answer 1

Answer:

here,

frictional force = ma

or,μR=ma

or,μmg=ma

or,a=μg

     =0.4*10

     =4m/s²

now

v²=u²-2as

0=8²-2*4*s

∴s=8m

so option (a) is correct