The speed of bullet of mass 20 g having kinetic energy equal to 100 J is ______________ m/s.
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Answer:
The speed of a bullet of mass 20 g having kinetic energy equal to 100 J is 100 m/s.
Explanation:
The mass of the bullet, m = 20 g = 0.02 Kg
The kinetic energy of the bullet, K.E = 100 J
The equation to find the kinetic energy of a body is given by:
K.E = (mv²) / 2
From the above equation velocity of the bullet can be calculated as:
v² = (2 × K.E) / m
= (2 × 100) / 0.02
v² = 10000
∴ v = √10000
v = 100 m/s
The magnitude of velocity and speed are the same. So the speed of the bullet is also 100 m/s.
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