A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast (what speed) were they running
1 answer:
Answer:
Speed, v = 5 m/s
Explanation:
We have,
The length of the football field, l = 100 m
A person takes 20 seconds to run its length.
It is required to find the speed of the person with which he should run. The distance covered divided by time taken is called its velocity.
So, the speed of the person is 5 m/s.
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Let us list out what we know from the question.
Initial Velocity since the piton is 'dropped'.
Vertical Displacement of the piton D = 215 m
Acceleration due to gravity
Final Velocity
Using the equation, and plugging in the known values, we get
Simplifying by taking square-root on both sides gives us
Thus, the speed of the piton just before striking the ground is 65 m/s.
Answer: 22kgm^2/s
Explanation:
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