Question

the speed of a body change from 2 metre per second to 10 metre per second in 2 seconds and from 10 metre per second to 15 metre per second in next 1 second calculate the acceleration in first 2 second, next 1 second and entire 3 second​

Answer 1

In 1st case,u=2m/s

v=10m/s t=2s

By using the formula,

acceleration=change in velocity/time taken

a=v - u /t

=10-2/2

=8/2. =4m/s^2.

In 2nd case,

u=10m/s v=15m/s. t=1s

a=15-10/1

=5m/s^2.

Acceleration in entire 3s=(4+5)/2

=9/2 m/s^2

=4.5 m/s^2.

Thank you!