If a car at rest, accelerates uniformly to a speed of `144 km//h` in `20s`, it covers a distance of

Options

A. 20 m
B. 400 m
C. 1440 m
D. 2880 m

Answer

B

Explanation

Here ` " " v= 144 km //h =40 m //s `
` " " v=u+ at rArr 40=0 + 20 xx a rArr a=2 m//s ^(2) " "therefore s= (1)/(2) at^(2) =(1)/(2) xx 2xx (20) ^(2) =400 m . `