Q7 of 13 Page 134

Two identical balls each of mass 4kg are moving towards each other with speeds 2 ms–1 and 3 ms–1 respectively. They undergo head on perfectly elastic collision. Then impulse imparted by one ball on other is

In a perfectly elastic collision

(i) Linear momentum is conserved


(ii) Kinetic energy is conserved


(iii) Total energy is conserved


In case of a perfect elastic collision of two identical masses the velocities are interchanged.


So if initial velocities of ball A and Ball B are and respectively, then the final velocities and such that





Then impulse imparted by one ball on other is




More from this chapter

All 13 →
5

5 examples of negative work done.

 6

Write two points of difference between electric energy and electric power

 8

A running man has half the kinetic energy that a boy half his mass has. The man speeds up by 1.0ms–1 and then has the same energy as the boy. What were the original speed of the man and the boy?

 9

A truck weighing 1000 kg changes its speed from 36 km h1 to 72 km h–1 in 2 minute. Calculate the work done and power spent.