Question

6. Maximum speed of vehicle on a circular track is 15
km/hr. When a track becomes wet, the maximum safe
speed is 10 km/hr. The ratio of the coefficients of friction
of dry track to wet track is....(MHTCET 2000)

a) 9:4b) 3:2 c)2:3 d) 1.5: 1​

Answer 1

Answer:9:4

Explanation:

V1=✓μ1rg ......1

V2=√μ2rg.....2

Divide 1 by 2

V1/v2=√μ1/√μ2

μ1/μ2= 225/100

μ1/μ2=9/4