A car acquires a velocity 40 km/h in 50 min. if the acceleration of the car is 2 km/`hr^(2)`. Find the approx initial velocity 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=40km//hr`
`t=50"min"=(50)/(60)h`
`a=2km//h^(2)`
u=?
We know that
`v=u+at`
`40=u+2xx(5)/(6)`
`implies u=40-(5)/(3)=(120-5)/(3)`
`=(115)/(3)=38.34km//h`