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JEE PHYSICS MCQ: MOTION IN A STRAIGHT LINE
1
Medium
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Understanding
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Consider the motion of the tip of the minutes hand of a clock. In one hour
I. The displacement is zero
II. The distance covered is zero
III. The average speed is zero
IV. The average velocity is zero
I. The displacement is zero
II. The distance covered is zero
III. The average speed is zero
IV. The average velocity is zero
View answer and explanation
Correct option: C
A and D are correct
Option C is correct because in one hour, the minute hand completes a full circle, resulting in zero displacement and zero average velocity, but non-zero distance and average speed.
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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