A truck crosses a stationary motorcycle at a speed of 54 km/h. At the same instant, the motor cyclist follows the truck by accelerating his motorcycle at the rate of 1 ms. The motor cyclist catches the truck after a time interval of:

Options

A. 45 s
B. 40 s
C. 30 s
D. 60 s

Answer

c

Explanation

`s_2` for truck `=54xx(5)/(18)xxt`
`s_2` for motor cyclist =`0+1//2 xx1xxt^(2)`
But `s_1=s_2`
`54xx(5)/(18)xxt=(t^(2))/(2)` or t=30s