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Home /Doubts and Solutions/CBSE/Class 9/Physics/Force And Laws Of Motion

# Force And Laws Of Motion Free Doubts and Solutions

## why a book on a table is not considered a action-reaction pair although normal force and weight(due to gravity or gravitational force of earth)are equal and opposite?

Asked by abinash.gupta003 17th August 2016, 7:14 PM

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## Describe the nature of force acting in the above shown displacement time graphs

Asked by Shringoyal 18th September 2015, 12:10 PM

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## In a rocket , fuel burns at the rate of 1kg/s .This fuel is ejected from the rocket with a velocity of 60km/s . This exerts a force on rocket equal to ;-

Asked by SIDDHARTH SHARMA 24th November 2014, 11:16 AM

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## The speed of a train at a constant rate α from zero to v , then remains constant for an interval , and finally decreases to zero at a constant rate β . If L be the total distance travelled then the total time taken is  ans.:- L/V + V/2[1/α+1/β] HOW TO FIND IT ?

Asked by SIDDHARTH SHARMA 24th November 2014, 10:59 AM

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## How can we derive newton's 1st law of motion with the 3rd law mathematically?

Asked by Arkajyoti Banerjee 11th October 2014, 12:58 AM

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## A ball was moving at a velocity of 10m/s from rest and its mass is 200g. suddenly it was struck by a hockey stick which made it return along its original path at the velocity of 5m/s. What amount of impulse did act on the ball?

Asked by Arkajyoti Banerjee 20th September 2014, 5:43 PM

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## (i) A ball was moving at a velocity of 10m/s from rest and its mass is 200g. suddenly it was struck by a hockey stick which made it return along its original path at the velocity of 5m/s. What amount of impulse did act on the ball?

Asked by Arkajyoti Banerjee 20th September 2014, 5:43 PM

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## "The direction in which an object moves is given by the direction of velocity of the object and not by the direction of acceleration". Give an example to justify this statement.

Asked by Aravind soumi 11th September 2014, 3:35 PM

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## A body of mass 10 kg is moving with the velocity of 10 m/s. It collides with a body of mass of 5 kg which is in rest. What is the total velocity after the collision?

Asked by Arkajyoti Banerjee 30th August 2014, 1:16 AM

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## Difference between a permanent magnet and a temporary magnet.

Asked by Aparajita Ambastha 15th August 2014, 9:45 PM