Question

A bullet of mass 8g is fired with a velocity of 80 m/s.Calculate its kinetic energy

Answer 1

K.E.= 1/2 mv square

8 g=0.008 kg

K.E.= 1/2* 0.008* (80)Square

=    25.6 kgm/s

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Answer 2

Given :

Mass of the bullet (M) = 8 gm = 8 × 10⁻³ Kg

Velocity (V) = 80 m/sec

To Find :

Kinetic energy of the bullet

Solution :

The ability of a body to do work due to its speed alone is called Kinetic Energy.

Kinetic Energy (KE) = $\frac{1}{2}mv^2$

Where, m = Mass; v = Velocity of the bullet

∴ Kinetic Energy (KE) =  $\frac{1}{2}$×8×10⁻³×(80)²
                                   =  25600 × 10⁻³ J

                                   =  25.6 J

Therefore, the kinetic energy of the bullet is 25.6 J.