When the motion of one or both of the particles is at an angle to the line of impact, the impact is said to be ) central impact(b) oblique impact(c) major impact(d) none of the above. the ratio of the restitution impulse to the deformation impulse is called ) impulse ratio(b) restitution coefficient (c) energy ratio(d) mechanical efficiency

The first one is:

(B) oblique impact.

The second one is:

(B) restitution coefficient

Explanation:

A central impact is when both masses are at the line of the impact. When one or both are at an angle, we have an oblique impact. So, the answer of the first one is (B).

The restitution coefficient is the ratio between the restitution impulse to the deformation impulse is called. So, the answer of the second one is also (B).