Question

Q.25 A body of mass 5x103 kg moving with speed 2 m/s collides with a
body of mass 15x103 kg inelastically & sticks to it. Then loss in K.E. of
the system will be:
(2019)
A 7.5 kJ
B 15 kJ
C 10 kJ
D 5 kJ​

Answer 1

Answer:

Loss in K.E.=

2

1

M

1

+M

2

M

1

M

2

V

2

(1−e

2

)

=

2

1

×

20×10

3

5×10

3

×15×10

3

×(2)

2

⋅(1−(0)

2

)

=

2

1

×

20

75×10

3

×4

=7.5 kJ.