3. If a 50-kg person is running at 2 m/s and a 25-kg person is running at twice that speed, the 50-kg person is harder to stop.

A. The 50-kg person has more momentum.
B. The 25-kg person has more momentum.
C. The two people have the same momentum.
D. We cannot determine which one has more momentum.

The two people have the same momentum.

Explanation:

Given that,

Mass of person 1 is 50 kg and he is running at 2 m/s.

Mass of person 2 is 25 kg and he is running at twice  that speed i.e. 4 m/s

The momentum of an object is given by :

p = mv

For person 1,

For person 2,

So, it can be seen that both persons will have the same momentum. Hence, the correct option is (c).

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.