Acar moves at a speed of 50 kilometers/hour. its kinetic energy is 400 joules. if the same car moves at a speed of 100 kilometers/hour, then its kinetic energy will be 800 1,600 3,200 4,500 joules.

If the same car moves at a speed of 100 kilometers/hour, its new kinetic energy will be 1600 Joules.

Explanation:

Kinetic energy is defined as energy of a body due to its motion.

Where:

v = Velocity of the body in m/s.

m = Mass of the body

Given:

v = 50 km/h=

1 km = 1000 m

1 hour = 3600 seconds

Kinetic energy of the body,K.E = 400 Joules

Mass of the body = ?

If the same car moves at a speed of 100 kilometers/hour, then its kinetic energy will be K.E'

New velocity of the car = v'=100 km/h =

=

If the same car moves at a speed of 100 kilometers/hour, its new kinetic energy will be 1600 Joules.

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