Question

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

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

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

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