Answer:
A
Explanation:
The acceleration of an object is directly proportional to its net force.

Answer:
276 days
Explanation:
1/4 th of the original means <u><em>2 half lives</em></u>
1 half life = 138 days
So,
2 half lives = 276 days
Explanation:
The kinetic energy of an object is given in terms of its mass and object as :

An object with more mass has more kinetic energy. An object with less mass, if both objects are moving at the same speed, in opposite directions, will have less kinetic energy. The square of v will give positive number.