A car travels equal distances in the same direction with velocities $60{\rm{km}}{{\rm{h}}^{ - 1}}\,,\,20\;{\rm{km\;}}{{\rm{h}}^{ - 1}}$ and $10\;{\rm{km\;}}{{\rm{h}}^{ - 1}}$ respectively. The average velocity of the car over the whole journey of motion is

${\rm{6}}\,{\rm{m}}{{\rm{s}}^{ - 1}}$

NEET UG PHYSICS MCQ: MOTION IN A STRAIGHT LINE

1 Easy

1 of 1

Application +4 | -1

A car travels equal distances in the same direction with velocities

60\mathrm{km}{\mathrm{h}^{ - 1}}\,,\,20\;\mathrm{km\;}{\mathrm{h}^{ - 1}}

and

10\;\mathrm{km\;}{\mathrm{h}^{ - 1}}

respectively. The average velocity of the car over the whole journey of motion is

View answer and explanation

Correct option: D

5\,\mathrm{m}{\mathrm{s}^{ - 1}}

Option D (

5\,\mathrm{m}{\mathrm{s}^{ - 1}}

) is correct because it represents the harmonic mean of the velocities, converted to m/s.

Practice All Chapter MCQs →

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

30\mathrm{km}{\mathrm{h}^{ - 1}}

1 \mathrm{~ms}^{-2}

150 \mathrm{~m}

2 \mathrm{~ms}^{-2}

{V_1} = 10\,kmph

{V_2} = 20\,kmph

{V_3} = 60\,kmph