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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.
Related Questions: - Resistances n, each r Ω, when connected in parallel give an equivalent resistance
- Electrical force is acting between two charges kept in vacuum. A copper plate
- The phase difference between two points seperated by 0.8 m in a wave of frequency
- The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol.
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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
- Resistances n, each r Ω, when connected in parallel give an equivalent resistance
- Electrical force is acting between two charges kept in vacuum. A copper plate
- The phase difference between two points seperated by 0.8 m in a wave of frequency
- The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol.
- The electric field in a certain region is acting radially outward and is given by E=Ar.
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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