Question

a 20 kg block moving East at 30 metre per second collides with 25 kg block of rest . the two blocks stick together. what is the final speed of two blocks​

Answer 1

Answer:

25 kg block collides??????????

Answer 2

The final speed of the two blocks is 13.3ms-1.

Given:

20 kg block moving East at 30 metres per second collides with 25 kg block of rest. the two blocks stick together.

To Find:

The final speed of two blocks.

Solution:

To find the final speed of two blocks we will follow the following steps:

As we know,

It is an inelastic collision because two blocks stick after the collision but their momentum is conserved.

So,

Initial momentum = final momentum

M1V1 + M2V2 = ( M1+M2)V

V is the final speed of two blocks and M1 and M2 are the mass of two blocks.

V1 and V2 are initial velocities.

Now,

Putting values in the above formula we get,

20×30+ 25×0 = (20+25)V

600 = 45V

$v = \frac{600}{45} = 13.3m {s}^{ - 1}$

Henceforth, the final speed of the two blocks is 13.3ms-1.