Question

A bullet of mass 10 g find the velocity

Answer 1

Answer:

The correct option is A.

Mass of the bullet is 10g

Velocity=400m/s

Mass of the wooden block is 2kg

Length=5m

Let the velocity of the bullet and the block after the collision will be v

1

&v

2

The block rises 410cm=0.1m

A/C Conservation of the energy of the block:

PE at the maximum height =KE at the bottom of the block,

m

2

gh=

2

1

m

2

v

2

2

v

2

=

2gh

=

2×9.8×0.1

=1.4m/s

Let u

1

is the initial velocity of the bullet, then according to the conservation of momentum,

m

1

u

1

=m

2

v

2

+m

1

v

1

v

1

=

m

1

m

1

u

1

−m

2

v

2

=

0.01

0.01×400−2×1.4

=120m/s

Explanation:

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