An escalator is 18.3 m long. If a person stands on the escalator, it takes 47.8 s to ride from the bottom to the top. If a perso
1 answer:
Answer:
20.243 s
Explanation:
Because the escalator and person moving in the same direction, relative velocity can be calculated by summing the velocity of the escalator and velocity of the person.
The speed of escalator can be calculated as,
Relative velocity
Therefore total time required to take the person to get to the top
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Answer:
Option A
,
Explanation:
When the ball its thrown up, at half way of its flight it means half of its vertical height which is .
potential energy = mgh
since it moved half way of height
P.E =
This means for the body to have gained half of its P.E, it will loose half of its kinetic energy.
Final kinetic energy() = E/2
kinetic energy =
let the final velocity at halfway flight be v1
= E/2
=
cross multiply we have
=
cancel m from both sides
=
take the square root of both sides,
Thus our final velocities will be E/2 and