Question

An object of mass 2kg is moving with a velocity of 2m/s. Another object of mass 2kg is moving with a velocity of 3m/s. The ratio of K.E of first body to that of second body is​

Answer 1

Explanation:

Here, a body of mass 2 kg moving with a velocity of 3ms

−1

collides head on with a body of mass 1 kg moving with a velocity of 4ms

−1

in opposite direction. After collision the two bodies stick together and move with a common velocity.

We can write,

m

1

u

1

−m

2

u

2

=(m

1

+m

2

)v

(2)(3)−(1)(4)=(2+1)v

2=3v

⇒v=

3

2

ms

−1

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Answer 2

An object of mass 2kg is moving with a velocity of 2m/s. Another object of mass 2kg is moving with a velocity of 3m/s. The ratio of K.E of first body to that of second body is