A car acquires a velocity 40 km/h in 50 min . If the acceleration of the car is 2 `km//hrhr^(2)` .Find the approx initial veloity of that car .

Options

A. `38.33` km/h
B. `42.33` km/h
C. `24.30` km/h
D. Can't calculate

Answer

A

Explanation

Given , v = 40 km/hr
t = 50 min = `50/60 "hr"`
`a=2 km//h^(2)`
`t= 50 min = 50/60 h`
`a= 2 km//h^(2)`
u = ?
We know that
v = `u+"at"`
`40 = u+2 xx5/6`
`rArr " " u = 40 - 5/3 = (120-5)/3`
` (115)/3 = 38.34 km//h`