Question

A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?

Answer 1

Answer:

Mass = m = 15 g = 0.015 kg                                 [ 1kg = 1000 g ]

Velocity = v = 400 m/s

K.E = 1/2 mv²

     = 1/2 × 0.015 × 400 × 400  = 1200 Joules

Work done = K.E

W = 1200 J

W = F × s

.................................................................

s = 2 cm = 0.02 m

1200 = 0.02 F

F = 1200 / 0.02

F = 60000 N ==> Answer

The energy gets converted to Heat Energy .

Explanation:

hope this helps u sisi

Answer 2

Hi Sis !

Here is ur Answer !!

Answer:

Given,

(iii) The Kinetic energy is converted to heat & sound energy.

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