A 1 kg block moving at 8 m/s to the right collides with a 10 kg block moving at 1 m/s to the left. After colliding, the blocks stick together.

Question

A 1 kg block moving at 8 m/s to the right collides with a 10 kg block moving at 1 m/s to the left. After colliding, the blocks stick together.

Their final motion will be:

a) Greater than or equal to 8 m/s to the right

b) Less than 8 m/s to the right

c) Greater than or equal to 1 m/s to the left

d) Less than 1 m/s to the left

e) 0 m/s , they will be at rest.

Answer 1

This is an inelastic collision. We iuse the conservation of momentum: using to right at positive and momentum is mass x velocity. We get the equation mo beofre = mo after as:

(1)(+8) + (10)(-1) = 1V + 10V

11v = -2 or V = -2/11

So, the negative implies to the left. So answer D