A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity 4 m s -1 . The ball strikes the water surface after 4 s . The height of bridge above water surface is (Take g =10 m s -2 ):

Physics · Motion in one Dimension

NEET (UG) 2023 — Question 37

A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity $4 \mathrm{~m} \mathrm{~s}^{-1}$ . The ball strikes the water surface after 4 s . The height of bridge above water surface is (Take $\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}$ ):

Option A:
60 m
Option B:
64 m
Correct
Option C:
68 m
Option D:
56 m

Answer: B

Step-by-step solution

\begin{aligned} s & =u t-\frac{1}{2} g t^2 \\ & =16-\frac{1}{2} \times 10 \times 16 \\ & =-64 \mathrm{~m} \end{aligned}

Height of bridge above water surface $=64 \mathrm{~m}$

Answer key and solution verified before publishing.

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Exam: NEET (UG) 2023
Paper: 2023 paper
Subject: Physics
Chapter: Motion in one Dimension
Topic: Motion Under Gravity

A vehicle travels half the distance with speed vartheta and the remaining distance with speed 2 vartheta . Its average speed is:

Answer: B

Step-by-step solution

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