Well idk if this helps but the formula to solve acceleration is
a=F/m=(100kg)=1.0m/s 2
<u>Answer:</u> The velocity of released alpha particle is 
<u>Explanation:</u>
According to law of conservation of momentum, momentum can neither be created nor be destroyed until and unless, an external force is applied.
For a system:

where,
= Initial mass and velocity
= Final mass and velocity
We are given:

Putting values in above equation, we get:

Hence, the velocity of released alpha particle is 
Answer:
The correct answers are It is the resistance of an object to changes in its motion, and It is a force