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NEET UG PHYSICS MCQ: MOTION IN A STRAIGHT LINE

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A stone dropped from a building of height h and it reaches after t seconds on earth. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after

{t_1}

and

{t_2}

seconds respectively, then

View answer and explanation

Correct option: C

t = \sqrt {{t_1}{t_2}}

Option C (

t = \sqrt {{t_1}{t_2}}

) is correct. By analyzing the equations of motion for each scenario and eliminating the initial velocity, we find that the time for the dropped stone is the geometric mean of the times for the stones thrown upwards and downwards.

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150 \mathrm{~m}

behind it starts from rest with an acceleration of

2 \mathrm{~ms}^{-2}

. After how much time, the car catches up with the scooter? A motor vehicle travelled the first one third of a distance ‘S ’ at a speed of

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, the second one third at a speed of

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and the last one third at a speed of

{V_3} = 60\,kmph

determine the mean speed of the vehicle over the entire distance ‘S ’