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JEE PHYSICS MCQ: MOTION IN A STRAIGHT LINE

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If a particle travels

n

equal distances with speeds

v_1, v_2, \ldots, v_n

then the average speed

\bar{V}

of the particle will be such that

View answer and explanation

Correct option: C

\frac{1}{\bar{V}}=\frac{1}{n}\left(\frac{1}{v_1}+\frac{1}{v_2}+\cdots+\frac{1}{v_n}\right)

Option C (

\frac{1}{\bar{V}}=\frac{1}{n}\left(\frac{1}{v_1}+\frac{1}{v_2}+\cdots+\frac{1}{v_n}\right)

) is correct because it represents the harmonic mean of the speeds when distances are equal.

More Questions from MOTION IN A STRAIGHT LINE

Practice All Chapter MCQs →

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