1.

A particle of mass m moving towards the east with speedcollides with another particle of the same mass and samespeed v moving towards the north. If the two particles sticto each other, the new particle of mass 2m will have a speeof(a) v(b) v/2(d) v2

Answer»

These particles are moving perpendicular to each other.

The figure of their motion is a right angled triangle.

The resultant velocity is the hypotenuse of the triangle formed.

The triangle is of base v and height vV.

By pythagoras theorem the hypotenuse is :

Hypotenuse = √(v² + v²) = √2v² = v√v

The velocity is thus :

= v√2



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