If two people, mass of 70 kg and 85 kg respectively, approach each other with speeds of 4 m/s and 7 m/s, what is the total momen
1 answer:
Answer:
a. Momentum A = 280 Kgm/s.
b. Momentum B = 595 Kgm/s.
c. Total momentum = 875 Kgm/s.
Explanation:
Let the two people be A and B respectively.
<u>Given the following data;</u>
Mass A = 70kg
Mass B = 85kg
Velocity A = 4m/s
Velocity B = 7m/s
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
a. To find the momentum of A;
<em>Momentum A = 280 Kgm/s. </em>
b. To find the momentum of B;
<em>Momentum B = 595 Kgm/s.</em>
c. To find the total momentum of the two persons;
Substituting into the equation, we have;
<em>Total momentum = 875 Kgm/s</em>.
You might be interested in
Answer:
The friend is wrong: the law of conservation of momentum is not violated
Explanation:
The law of conservation of momentum states that:
"For a system of an object, if the net external force acting on the system is zero, then the total momentum of the system is conserved"
In our problem, the system is the ball rolling down the hill. The ball gains speed as it rolls down, so its momentum increases, according to the equation:
where m is the mass of the ball and v its velocity. This may appear as a violation of the law, however it is not. In fact, the net external force acting on the ball is not zero, since there is the force of gravity acting on the ball. As a result, the force of gravity gives an acceleration to the ball, increasing its momentum: therefore, the law is not violated.