If a cyclist moving with a speed of 4.9 m/* on a level road can take a sharp circular turn of radius 4 m, then coefficient of friction between the cycle tyres and road is
(a) 0.51
(b) 0.41
(c) 0.71
(d) 0.61
Correct option (d) 0.61
Explanation :
While a cyclist moving with a speed v takes a sharp tum on a circular track of radius r, the coefficient of friction is given by