Question

an object of mass 0.4 kg is at rest work done to provide a velocity of 2 metre per second is​

Answer 1

Answer:

Class 11

>>Physics

>>Work, Energy and Power

>>Collisions in Two Dimensions

>>An object of mass 0.4 kg mo...

Question

Bookmark

An object of mass 0.4 kg moving with velocity of 4 m/s collides with another object of same mass moving in same direction with velocity of 2 m/s. If the collision is perfectly inelastic (plastic), then what will be the loss of K. E due to impact?

Medium

Solution

verified

Verified by Toppr

Linear momentum is conserved

0.4×4+0.4×2=0.8×v

as shown in figure and B.

v=

0.8

1.6+0.8

=3m/s

Kinetic energy before collision =

2

1

0.4(4)

2

+

2

1

0.4(2)

2

=3.2+0.8=4J

Kinetic after collision =

2

1

0.8(v)

2

=0.8×3

2

=3.6

Loss of kinetic energy =4−3.6=0.4J