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NEET 2020
Exam
NEET
Year
2020
Subject
Physics
Chapter
Motion in Two Dimensions

NEET 2020 · Physics · Motion in Two Dimensions

A ball is thrown vertically downward with a velocity of 20m s ^ - 1...

A ball is thrown vertically downward with a velocity of 20ms−120m{s}^{- 1} from the top of a tower. It hits the ground after some time with a velocity of 80ms−180m{s}^{- 1}. The height of the tower is: (g=10ms−2)\left(g = 10m{s}^{- 2}\right)A ball is thrown vertically downward with a velocity of 20m s ^ - 1 from the top of a tower. It hits the ground after

Options

  1. A340m340m
  2. B320m320m
  3. C300m300m
  4. D360m360m

Correct answer

C. 300m300m

Step-by-step solution

A ball is thrown vertically downward with a velocity of 20m s ^ - 1 from the top of a tower. It hits the ground after

We know that,

v2=u2+2gh{v}^{2} = {u}^{2} + 2gh
⇒802=202+2×10h⇒ {80}^{2} = {20}^{2} + 2 \times 10h
⇒h=300m⇒ h = 300m

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