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Lift travels in straight line at a const...

Lift travels in straight line at a constant speed of `3 cc 10^(8) m//s.` What is the acceleration of lift ?

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As speed of light is constant along a straight line. Hence, its acceleration is zero.
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PRADEEP-KINEMATICS-2 Very short
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  18. What does the slope of a speed-time graph indicate ?

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