A boy standing at top of a tower of 20 m height drops a stone

⇦

⇨

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:

1. A ray of light travelling in a transparent medium of refractive index µ, falls on surface
2. An inclined plane makes an angle of 30° with the horizontal.A solid sphere
3. In the Young’s modulus experiment, if length of wire and radius both are doubled,
4. What should be the velocity(v) of a sound source moving towards a stationary observer
5. The damping force on an oscillator is directly proportional to the velocity.

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

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends