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 spring balance is attached to the ceiling of a lift.A man hangs his bag on the spring
2. The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field
3. The potential energy of a weightless spring compressed by a distance D is proportional
4. A solenoid has length 0.4 cm, radius 1 cm and 400 turns of wire. If a current
5. When a beam of light is used to determine the position of an object,

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