Question

3. 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 2 cm, find out the
average force acting on the bullet.
Tano
10T​

Answer 1

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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 .

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Hope it Helps :)

Answer 2

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 .