Question

An object of mass 25 kg moving with a speed 40 m/s collides with an object of mass 15 kg which is at rest. After collision, they get combined and move with same speed. The speed of the combined mass is

Answer 1

Answer:

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Answer 2

Answer:

Mass of first body m

1

=40 kg and its velocity u

1

=4 m/s

Mass of second body m

2

=60 kg and its velocity u

2

=2 m/s

Energy lost in perfectly inelastic collision ΔKE=

2

1

m

1

+m

2

m

1

m

2

(u

1

−u

2

)

2

∴ ΔKE=

2

1

(40+60)

(40)(60)

(4−2)

2

=48 J