Question

A car covers 20m distance in 5sec .and next 20m in 3sec .what will be average speed of car.​

Answer 1

Answer: 5m/sec

Explanation:

Average speed = Total distance/ Total time

= (20m + 20m)/(5 seconds + 3 seconds)

= 40m/8 sec

= 5m/sec

Answer 2

Answer:

Let the total distance be 2x.

For first half distance :

Speed is 20 m/s

Thus time taken t1

= 20x

For second half distance :

Speed is 30 m/s

Thus time taken t 2

= 30x

Average velocity V avg

= t 1 +t 22x

⟹ V avg = 20x+30x

2x= 20+302×20×30

=24 m/s