Question

A mass of 2 kg moving at speed of 10 m/s collide with the mass of 3kg moving with 10m/s in opposite direction. They stick together after the collision. Find their combine speed?

Answer 1

Answer:

0m/s

Explanation:

A mass of 2 kg moving at speed of 10 m/s collide with the mass of 3kg moving with 10m/s in opposite direction. They stick together after the collision. Find their combine speed?

Answer 2

Answer:

Given : m

1

=2kg m

2

=1kg u

1

=3 m/s u

2

=4 m/s

Let the common velocity of the combined body be V

Mass of combined body M=2+1=3kg

Applying conservation of momentum :

2×3−1×4=3×V ⟹V=

3

2

m/s

Momentum of the system P=2×3−1×4=2 kg m/s

Loss in kinetic energy of the system due to collision ΔK.E=K.E

i

−K.E

f

ΔK.E=

2

1

(2)×3

2

+

2

1

(1)×4

2

−

2

1

(3)×(

3

2

)

2

⟹ΔK.E=

3

49

J