In a car race on straight road

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

In a car race on straight road, car A takes a time

t

less than car B at the finish and passes finishing point with a speed '

v

' more than of car B. Both the cars start from rest and travel with constant acceleration

a_1

and

a_2

respectively. Then '

v

' is equal to: (1)

\frac{2a_1 a_2}{a_1 + a_2} t

(2)

\sqrt{2a_1 a_2} t

(3)

\sqrt{a_1 a_2} t

(4)

\frac{a_1 + a_2}{2} t