Question

In an elastic head-on collision of bodies of mass m and (x2
- 9x + 21) m, the second body is at rest and the maximum
transfer of momentum takes place. Find the value of x
7
6
5
None of these​

Answer 1

Answer: 5

Explanation: for transfer of collision mass should be same. therefore,

                      x^2 -9x +21 = 1

from this you get x = 5 and -4