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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (मराठी सेमी-इंग्रजी) इयत्ता ९ वी

Give a scientific reason. When an object falls freely to the ground, its acceleration is uniform.

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प्रश्न

Give a scientific reason.

When an object falls freely to the ground, its acceleration is uniform.

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उत्तर

When an object falls freely to the ground, it is under the effect of a constant force known as the force of gravity. No other forces act on it. Hence, from Newton's second law of motion, we can say that this constant force of gravity accelerates the freely falling object uniformly. This uniform acceleration is known as acceleration due to gravity which acts towards the centre and is denoted by g.

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पाठ 1: Laws of Motion - Exercises [पृष्ठ १७]

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बालभारती Science and Technology [English] 9 Standard Maharashtra State Board
पाठ 1 Laws of Motion
Exercises | Q 5. a. | पृष्ठ १७

संबंधित प्रश्‍न

Define acceleration. State its unit.


What is meant by the term retardation? Name its S.I. unit.


The unit of retardation is ____________


When is the acceleration due to gravity positive?


Draw velocity – time graph for the following situation:

When a body is moving with variable velocity and variable acceleration.


An aeroplane lands at 216 kmh−1 and stops after covering a runway of 2 m. Calculate the acceleration and the time, in which it comes to rest.


A cyclist driving at 36 kmh−1 stops his motion in 2 s, by the application of brakes. Calculate

  1. retardation
  2. distance covered during the application of brakes.

What is the SI unit of acceleration?


What does a negative acceleration mean?

Write the SI unit of retardation.


A car traveling at 60 km/h, stops on applying brakes in 10 seconds. What is its acceleration?


The speed of a car increases from 10 km/h to 64 km/h in 10 seconds. What will be its acceleration?


Out of energy and acceleration, which one is a vector?


State if the following situation is possible:
A body moving horizontally with an acceleration in vertical direction.


Exercise Problem.

A racing car has a uniform acceleration of 4 ms–2. What distance it covers in 10 s after the start?


The acceleration of the body that moves with a uniform velocity will be ______.


When an object undergoes acceleration ______.


A car is being driven at a speed of 20ms-1 when brakes are applied to bring it to rest in 5 s. The deceleration produced in this case will be ______.


Acceleration is a scalar.


When a body is said to be in

  1. uniform acceleration
  2. non–uniform acceleration?

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