Question

A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is

Answer 1

Answer:-

• Mass=m=800kg
• Velocity=v=25m/s
• Time=t=20s

We know that

$\boxed{\sf Power=\dfrac{mv^2}{2t}}$

$\\ \sf\longmapsto Power=\dfrac{800\times 25^2}{2(20)}$

$\\ \sf\longmapsto Power=\dfrac{800\times 225}{40}$

$\\ \sf\longmapsto Power=20\times 225$

$\\ \sf\longmapsto Power=4500w$