# 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 that of car B. Both the cars start from rest and travel constant acceleration a1 and a2 respectively.  Then ‘v’ is equal to a. b. c. d.

## Question ID - 50183 :- 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 that of car B. Both the cars start from rest and travel constant acceleration a1 and a2 respectively.  Then ‘v’ is equal to a. b. c. d.

3537

For A & B let time taken by A is t0

From question,

VA−VB−V=(a1−a2)t0−a2t                     … (i)

XB=Xa= a1   a2 2

=

t0 =                          … (ii)

Putting t0  in equation

V=(a1−a2 2t

= v=

+

Next Question :

A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns.  The output power is delivered at 230V by the transformer.  If the current in the primary of the transformer is 5A and its efficiency is 90%, the output current would be:

 a. 25A b. 50A c. 35A d. 45A