Question

A bullet of mass 10g is moving with a speed of 500m/s

Answer 1

Answer:

Explanation:

This is a question on linear motion.

We will use the following equation of linear motion to get acceleration.

v² = u + 2as

Where v = final velocity = 0

u = initial velocity = 500m/ s

a = acceleration.

s = displacement = 5cm

Convert this to meters : 5/100 = 0.05m

Substituting the values into the formulae :

0 = 500 + 2 × 0.05 × a

0 = 500 + 0.1a

- 500 = 0.1 a

a = 500 / 0.1

a = - 5000 m/s² ( the negative sign shows retardation)

Force = Mass × Acceleration

Mass = 10/1000 = 0.01 Kg

F = 5000 × 0.01 = 50N

Work done = Force × displacement

50 × 0.05 = 2.5 Joules.

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