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JEE PHYSICS MCQ: MOTION IN A STRAIGHT LINE
1
Medium
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Application
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A driver takes to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he is driving a car at a speed of and the brakes cause a deceleration of , find the distance travelled by the car after he sees the need to put the brakes on.
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Correct option: A
25.5 m
Option A (25.5 m) is correct because it accounts for both the distance traveled during the reaction time and the distance traveled while decelerating.
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Assertion: In a free fall, the initial velocity of a body may not be zero.
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Reason: Free fall means the vertical acceleration of the body is equal to . A ball is thrown vertically upward with speed 15 m/s and it returns to the ground with speed 10 m/s as a constant air resistance acts. The maximum height attained by the ball is Which of the following is not a derived quantites? Assertion: If a body is dropped from the top of a tower of height and another body is thrown up simultaneously with velocity from the foot of the tower, then both of them would meet after a time .
Reason: For a body projected upwards, the distance covered by the body in the last second of its upward journey is always irrespective of velocity of projection. A particle is having uniform acceleration. If its displacement from to second is and change in velocity is . Find its displacement (in ) in second. An aeroplane flies 400m north and 300m south and then flies 1200m upwards, then net displacement is