A boy and his skateboard have a combined mass of 65 kg. What is the speed of the boy and skateboard if they have a momentum of 2
2 answers:
Answer : The velocity is given by 4.2 m/s.
Explanation :
It is given that,
Mass of a boy and the skateboard is, m = 65 kg
The momentum of the combined system is, p = 275 kg m/s
We know that the momentum of a body is the product of its mass and the velocity with which it is moving.
i.e.
or
The speed of the boy and the skateboard is 4.2 m/s.
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Answer:
The person with locked legs will experience greater impact force.
Explanation:
Let the two persons be of nearly equal mass (say m)
The final velocity of an object (person) dropped from a height H (here 2 meters) is given by,
( = acceleration due to gravity)
which can be derived from Newton's equation of motion,
Now, the time taken (say ) for the momentum (
) to change to zero will be more in the case of the person who bends his legs on impact than who keeps his legs locked.
We know that,
Naturally, the person who bends his legs will experience lesser force since is larger.