Question

3. If a bullet having the mass of 50 g is fired at the velocity of 200km per hour, how much

kinetic energy does it have?
​

Answer 1

77.3J

Step-by-step explanation:

Given parameters:

Mass of the bullet = 50g = 0.05kg

Velocity of the bullet = 200km/hr

Unknown:

Kinetic energy of the bullet = ?

Solution:

Kinetic energy is the energy due to motion of a body.

It is mathematically expressed as;

K.E =
`(1)/(2)` m v²

m is the mass

v is the velocity

we need to convert the velocity to m/s

200km/hr is 55.6m/s

Input the parameters and solve;

K.E =
`(1)/(2)` x 0.05 x 55.6² = 77.3J