JEE PHYSICS MCQ: MOTION IN A STRAIGHT LINE

1 Medium

1 of 1

Application +4 | -1

Two trains travelling on the same track are approaching each other with equal speeds of

40\mathrm{m}{\mathrm{s}^{ - 1}}

. The drivers of the trains begin to decelerate simultaneously when they are just 2 km apart. If the decelerations are both uniform and equal, then the value of deceleration to barely avoid collision should be

View answer and explanation

Correct option: A

0.8\mathrm{m}{\mathrm{s}^{ - 2}}

Option A (

0.8\mathrm{m}{\mathrm{s}^{ - 2}}

) is correct because it is the deceleration required to avoid collision, calculated using kinematics.

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)

second is

120 \mathrm{~m}

and change in velocity is

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

. Find its displacement (in

\mathrm{m}

) in

(t+2)

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