Question

a car is running with the velocity of 72km/hr .what will be its velocity after 5s if its acceleration is -2m/s^2?​

Answer 1

• Initial velocity=u=72km/h

Convert to m/s

`\\ \rm\Rrightarrow 72* (5)/(18)=20m/s`

• Acceleration=a=-2m/s^2
• Time=t=5s
• Final velocity=v

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

`\\ \rm\Rrightarrow v=20+(-2)(5)`

`\\ \rm\Rrightarrow v=20-10`

`\\ \rm\Rrightarrow v=10m/s`