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A bomb of mass 3.0 kg explodes in air into two pieces of masses 2.0 kg and 1.0 kg .The smaller mass goes at a speed of .The total energy imparted to the two fragments is

a)

1.07 kJ

b)

2.14 kJ

c)

2.4 kJ

d)

4.8 kJ



Question ID - 51058 | SaraNextGen Top Answer

A bomb of mass 3.0 kg explodes in air into two pieces of masses 2.0 kg and 1.0 kg .The smaller mass goes at a speed of .The total energy imparted to the two fragments is

a)

1.07 kJ

b)

2.14 kJ

c)

2.4 kJ

d)

4.8 kJ

1 Answer
127 votes
Answer Key / Explanation : (d) -

(d)

From law of conservation of momentum, when no external force acts upon a system of two (or more) bodies, then the total momentum of the system remains constant.

Momentum before explosion =momentum after explosion.

since bomb v at rest, its velocity is zero, hence,

Total energy imparted is

=1600+3200=4800J

=4.8kJ

127 votes


127