a bullet of mass 40 g has its kinetic energy equal to 300J. Find the speed of the bullet.
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Answer:
The speed of the bullet is 122.5 m/s.
Explanation:
Mass of the bullet, m = 40 g
= 0.04 Kg
The kinetic energy of the bullet, K.E = 300 J
The equation to find the kinetic energy is given as:
K.E = (mv²) / 2
Where m and v are the mass and velocity of the body respectively.
Velocity can be calculated as;
v² = (2 × K.E) / m
= (2 × 300) / 0.04
= 600 / 0.04
v² = 15000
∴ v = √1500
v = 122.5 m/s
The magnitude of velocity and speed are equal. ∴ the speed of the bullet is also 122.5 m/s.
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