Answer:
A few of the positive particles aimed at a gold foil seemed to bounce back.
Explanation:
Answer: The motion of the object will remain the same
Explanation:
The kinetic energy is given by:

We know the mass and the maximum speed, plugging their values in the expression above we have:

Therefore, the answer is d.
Answer:
Object 3 has greatest acceleration.
Explanation:
Objects Mass Force
1 10 kg 4 N
2 100 grams 20 N
3 10 grams 4 N
4 1 kg 20 N
Acceleration of object 1,

Acceleration of object 2,

Acceleration of object 3,

Acceleration of object 4,

It is clear that the acceleration of object 3 is
and it is greatest of all. So, the correct option is (3).