Question

A plane starting from rest accelerates at 3m/s2 for 25s. Calculate the increase in velocity after:

1. 1s
2. 3s
3. 25s

Answer 1

• Initial velocity=u=0m/s
• Acceleration=a=3m/s^2

Time not needed now

Case-1:-

• Time=1s
• Final velocity=v

`\\ \rm\hookrightarrow v=u+at`

`\\ \rm\hookrightarrow v=0+3(1)`

`\\ \rm\hookrightarrow v=3m/s`

Case-2:-

• Time=3s

`\\ \rm\hookrightarrow v=0+3(3)`

`\\ \rm\hookrightarrow v=9m/s`

Case-3:-

• Time=25s

`\\ \rm\hookrightarrow v=0+3(25)`

`\\ \rm\hookrightarrow v=75m/s`