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JEE PHYSICS MCQ: MOTION IN A STRAIGHT LINE
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Medium
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Understanding
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A body is thrown vertically upwards with a velocity . Select the incorrect statements from the following.
I Both velocity and acceleration are zero at its highest point
II. Velocity is maximum and acceleration is zero at the highest point.
III. Velocity is maximum and acceleration is downwards at its highest point.
I Both velocity and acceleration are zero at its highest point
II. Velocity is maximum and acceleration is zero at the highest point.
III. Velocity is maximum and acceleration is downwards at its highest point.
View answer and explanation
Correct option: D
I, II and III
Option D is correct because at the highest point, the velocity is zero, and the acceleration is g downwards due to gravity.
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Assertion: In a free fall, the initial velocity of a body may not be zero.
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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
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