JEE Main 2020 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 8 January 2020, Shift 2, Physics Q21

Question 21 of 75 in this shift, Physics question 21 of 25, Section B.

A ball is dropped from the top of a

100\ \mathrm{m}

high tower on a planet. In the last

\frac{1}{2}

s before hitting the ground, it covers a distance of

19\ \mathrm{m}

. Acceleration due to gravity (in

\mathrm{ms^{-2}}

) near the surface on that planet is __________.

Official answer

8.00; 2888.00

NTA final key (Jan 2020): multiple answers accepted.

Chapter: Motion in a Straight Line
Topic: Kinematics in 1D
Idea tested: Free Fall Sign Conventions

Same idea in other shifts

Asked 10× in all

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28 Jul 2022, Shift 2 · Q21A ball is thrown vertically upwards with a velocity of $19.6\ \mathrm{ms^{-1}}$ from the top of a tower. The ball strikes the ground after…MediumNumerical value
24 Jun 2022, Shift 1 · Q57From the top of a tower, a ball is thrown vertically upward which reaches the ground in 6 s. A second ball thrown vertically downward from…MediumNumerical value
26 Jun 2022, Shift 1 · Q33An object is thrown vertically upwards. At its maximum height, which of the following quantity becomes zero ?EasySingle correct
26 Jun 2022, Shift 1 · Q52A ball of mass 0.5 kg is dropped from the height of 10 m. The height, at which the magnitude of velocity becomes equal to the magnitude of…EasyNumerical value
27 Jun 2022, Shift 2 · Q33When a ball is dropped into a lake from a height 4.9 m above the water level, it hits the water with a velocity $v$ and then sinks to the…EasySingle correct
4 Sep 2020, Shift 1 · Q2A Tennis ball is released from a height h and after freely falling on a wooden floor it rebounds and reaches height $\frac{h}{2}$ . The…MediumDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.