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JEE PHYSICS MCQ: MOTION IN A STRAIGHT LINE

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A ball is projected upwards from a height h above the surface of the earth with velocity v. The time at which the ball strikes the ground is

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Correct option: C

\frac{v}{g}\left[ {1 + \sqrt {1 + \frac{{2gh}}{{{v^2}}}} } \right]

Option C (

\frac{v}{g}\left[ {1 + \sqrt {1 + \frac{{2gh}}{{{v^2}}}} } \right]

) is correct because it is derived from solving the quadratic equation obtained by applying the equation of motion with constant acceleration.

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Assertion: In a free fall, the initial velocity of a body may not be zero.
Reason: Free fall means the vertical acceleration of the body is equal to

\mathrm{g}

. 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

\mathrm{h}

and another body is thrown up simultaneously with velocity

\mathrm{u}

from the foot of the tower, then both of them would meet after a time

\frac{\mathrm{h}}{\mathrm{u}}

.
Reason: For a body projected upwards, the distance covered by the body in the last second of its upward journey is always

4.9 \mathrm{~m}

irrespective of velocity of projection.

(\mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^2)

A particle is having uniform acceleration. If its displacement from

t

(t+1)

120 \mathrm{~m}

and change in velocity is

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

. Find its displacement (in

\mathrm{m}

(t+2)

second. An aeroplane flies 400m north and 300m south and then flies 1200m upwards, then net displacement is