NEET UG PHYSICS MCQ: MOTION IN A STRAIGHT LINE

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The driver of a car moving with a speed of

10\mathrm{m}{\mathrm{s}^{ - 1}}

sees a red light ahead, applies breaks and stops after covering 10m distance. If the same car were moving with a speed of

20\mathrm{m}{\mathrm{s}^{ - 1}}

, the same driver would have stopped the car after covering 30 m distance. Within what distance the car can be stopped if travelling with a velocity of

15\mathrm{m}{\mathrm{s}^{ - 1}}

? Assume the same reaction time and the same deceleration in each case.

View answer and explanation

Correct option: A

18.75 m

Option A (18.75 m) is correct because it calculates the stopping distance based on the assumption of constant deceleration and reaction time.

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Velocity-time curve for a body projected vertically upwards is Two cars A and B approach each other at the same speed, then what will be the velocity of A if velocity of B is

8 \mathrm{~m} / \mathrm{s}

? Two cars are moving in the same direction with a speed of

30\mathrm{km}{\mathrm{h}^{ - 1}}

. They are separated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 min. What is the speed of the third car? A body is projected vertically up with ‘u’. Its velocity at half its maximum height is A scooter starts from rest have an acceleration of

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

while a car

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

{V_1} = 10\,kmph

, the second one third at a speed of

{V_2} = 20\,kmph

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 ’