JEE Main 2020 (2 Sep, Shift 1) Physics Q2: Relative Velocity

Question

Train A and train B are running on parallel tracks in the opposite directions with speeds of 36 km/hour and 72 km/hour, respectively. A person is walking in train A in the direction opposite to its motion with a speed of 1.8 km/hour. Speed (in

\mathrm{ms^{-1}}

) of this person as observed from train B will be close to : (take the distance between the tracks as negligible)

(1) $30.5\ \mathrm{ms^{-1}}$
(2) $28.5\ \mathrm{ms^{-1}}$
(3) $31.5\ \mathrm{ms^{-1}}$
(4) $29.5\ \mathrm{ms^{-1}}$ Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Accepted Answer

Option 4: $29.5\ \mathrm{ms^{-1}}$

Answer

$30.5\ \mathrm{ms^{-1}}$

Answer

$28.5\ \mathrm{ms^{-1}}$

Answer

$31.5\ \mathrm{ms^{-1}}$

Answer

$29.5\ \mathrm{ms^{-1}}$

JEE Main 2 September 2020, Shift 1, Physics Q2

Same idea in other shifts