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A boy standing at top of a tower of 20 m height drops a stone.assuming g=10 ms⁻²,the velocity with which it hits the ground is
Options
(a) 20 m/s
(b) 40 m/s
(c) 5 m/s
(d) 10 m/s
Correct Answer:
20 m/s
Explanation:
Let, v²=u²+2gh
v= is the final velocity
u= is the initial velocity
g= is the acceleration
h= is the distance
Then, u =0
.·. v²=0²+2gh
v=√2gh
Given, g=10 m/s², h=20 m
.·. v=√2x10x20
v=20 m.
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Difficulty Level: Easy
(1008)
Topics: Motion in Straight Line
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The potential difference applied to an X-ray tube is 5 kV and the current through it
- A tuning fork vibrates with 2 beats in 0.04 second. The frequency of the fork is
- Dimensions formula for surface tension is
- A potentiometer wire of length 100cm has a resistance of 10Ω. It is connected in series
- A machine gun fires 10 bullets/s,each of mass 10 g,the speed of each bullet
Difficulty Level: Easy (1008)
Topics: Motion in Straight Line (93)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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