Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

Concepts Of Physics MCQ Edition [Volume 1]

Exam: Concepts Of Physics MCQ Edition [Volume 1]
Subject: Physics
Chapter: Rest and Motion Kinematics

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Rest and Motion Kinematics

From a point 100 m above the ground, a ball is thrown horizontally...

From a point

100 \text{ m}

above the ground, a ball is thrown horizontally with a speed of

20 \text{ m/s}

. Determine the time it takes to reach the ground in seconds.

Options

A $4.47$
B $5.00$
C $4.52$
D $2.00$

Correct answer

C. $4.52$

Step-by-step solution

The initial vertical velocity of the ball is

u_y = 0

.

The vertical displacement is

s_y = 100 \text{ m}

.

Using the second equation of motion for the vertical direction:

s_y = u_y t + \dfrac{1}{2} g t^2

Substituting the given values and taking

g = 9.8 \text{ m/s}^2

:

100 = 0 + \dfrac{1}{2} \times 9.8 \times t^2

100 = 4.9 t^2

t^2 = \dfrac{100}{4.9} = \dfrac{1000}{49}

t = \dfrac{10\sqrt{10}}{7} \approx 4.5 \text{ s}

Practice Rest and Motion Kinematics on Quantrex Academy →

More from Rest and Motion Kinematics

A man has to travel 50 m due north, 40 m due east, and 20 m due south to reach a field.… Concepts Of Physics MCQ Edition [Volume 1]A particle begins at the origin, travels along the X-axis to the point (20 m, 0) , and… Concepts Of Physics MCQ Edition [Volume 1]The distance from Patna to Ranchi is 260 km by air and 320 km by road. An aeroplane… Concepts Of Physics MCQ Edition [Volume 1]The distance from Patna to Ranchi is 260 km by air and 320 km by road. An aeroplane… Concepts Of Physics MCQ Edition [Volume 1]The distance from Patna to Ranchi is 260 km by air and 320 km by road. An aeroplane… Concepts Of Physics MCQ Edition [Volume 1]The distance from Patna to Ranchi is 260 km by air and 320 km by road. An aeroplane… Concepts Of Physics MCQ Edition [Volume 1]A man has to travel 50 m due north, 40 m due east, and 20 m due south to reach a field… Concepts Of Physics MCQ Edition [Volume 1]When a person departs his home for sightseeing by his car, the meter reads 12352 km .… Concepts Of Physics MCQ Edition [Volume 1] Full Rest and Motion Kinematics list All Concepts Of Physics MCQ Edition [Volume 1] PYQs