﻿ A player throws a ball upwards with an initial speed of 29.4 m s-1What are the velocity and acceleration of the ball at the highest point of its motion ? from Physics Motion in Straight Line Class 11 Manipur Board

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Motion in Straight Line

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A player throws a ball upwards with an initial speed of 29.4 m s-1
What are the velocity and acceleration of the ball at the highest point of its motion ?

At maximum height, velocity of the ball becomes zero.

Acceleration due to gravity at a given place is constant and acts on the ball at all points (including the highest point) with a constant value i.e., 9.8 m/s2.
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What is motion?

When an object changes it's position with time, with respect to it's surroundings, the object is said to be in motion.
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Is absolute rest or absolute motion possible?

Absolute rest and absolute motion is not possible because there is no point in the universe which is at rest and can be taken as point of reference. The planet Earth is in continuous motion.
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What is rest?

When an object does not change its position with time, with respect to it's surroundings. In such a case the object is said to be at rest.
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What is the most essential thing to study the motion of a body?

The most essential thing to study the motion is reference frame. Rest and motion are relative terms. It means that an object in one situation can be in rest but in another situation, the same object will be in motion.
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Can a body be always at rest in some frame?

Yes, a body is always at rest in a frame which is fixed with the body itself.
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