Question

A body moves along a straight line at a velocity of 10 m per second for 10 seconds and then at a velocity of 15 m per second for 15 seconds find the average velocity of the body

Answer 1

The distance travelled during the first 10 seconds is
distance = velocity*time
= 10*10
=100 meters
The distance travelled during the next 15 seconds is
distance (2)= velocity x time
=15*15
=225 meters.
average velocity = total distance travelled/total time taken
average velocity=(100+225)/(10+15)
=325/25= 13m/s

Answer 2

For the first ten seconds,
Velocity of the body= 10 m/s
Time= 10 seconds
Total distance travelled= 10 m/s × 10s= 100m
For the next 15 seconds,
Velocity of the body= 15 m/s
Time= 15 seconds
Total distance travelled= 15 m/s × 15s= 225m
Total distance(d)= 100m + 225m=325m
Total time(t)=10s+15s=25 seconds
Average velocity= Total distance travelled/Total time
= 325m/25s= 13m/s
Hope it helps you.