Question

Q.2. Why acceleration due to gravity is taken as -g for any object thrown in upward direction?
Q.3. Why objects reach the ground at different interval of time when they are dropped from
same height, at the same time in normal conditions?
Q.4.Write three equations of motion, by replacing acceleration (a), with acceleration due to
gravity, in them.
Please give me all quations answer ​

Answer 1

Answer:

1. So, if an object is moving vertically upwards, the direction of motion is positive for upwards joirney. Hence, the acceleration due to gravity is taken as negative as its direction is downward.

2. Acceleration due to gravity is independent of the mass of the object. The stone and feather dropped from the same height do not reach the ground at the same time because of air resistance.

Answer 2

Explanation:

Q2) acceleration due to gravity is taken as - g for any object thrown in upward direction as when a person throws an object in upward direction the applied force is in the opposite direction of the force applied due to gravity.

Q3) objects reach the ground at different interval of time when they are dropped from same height at the same time in normal conditions because Acceleration due to gravity is independent of the mass of the object. For e.g. the stone and the feather dropped from the same height do not reach the ground at the same time because of air resistance.

Q4) 1)

$v = u + gt$

2)

$s = ut + \frac{1}{2} g {t}^{2}$

3)

${v }^{2} = {u}^{2} - 2gs$

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