Question

A truck of mass 1000kg increases its speed from 36kmh to 72 kmh.find the increase in its kinetic energy

Answer 1

$\huge\red\bigstar$GIVEN:

•M=1000kg.

•u=36km/h $\implies$ 36 (5/18)=10m/s.

• v =72km $\implies$ 72 (5/18)=20m/s.

$\huge\red\bigstar$ FIND:

KINETIC ENERGY.

$\huge\red\bigstar$CALCULATION:

$\implies$ K. E =½M(V²-U²)

$\implies$ K. E =½ ×1000(10²-20²)

$\implies$ K.E =500×(200-100)

$\implies$ K. E =500 ×(100)

$\implies$ K. E=5000000J.

.°. KINETIC ENERGY IS 5000000J.