state the first law of motion? what is inertia? what is its SI unit? why is it advised to tie and luggage kept on the roof of a bus with a rope?
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according to first law of motion in a body at rest will remain at rest until external force is applied over it. a body in motion will remain in motion untii net external force is applied over it.... and the direction of a body moving in a straight line do not change until some external force is applied this is all because of inertia of rest motion and directions respectively..........inertia is the state of being in rest ,motion or maintaining a particular direction
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