Question:
If a ball is thrown vertically upwards with a velocity of 40 m/s, then velocity of the ball after two seconds will be $(g = 10 \, m/s^2)$
If a ball is thrown vertically upwards with a velocity of 40 m/s, then velocity of the ball after two seconds will be $(g = 10 \, m/s^2)$
Updated On: Jul 6, 2022
- 15 m/s
- 20 m/s
- 25 m/s
- 28 m/s
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The Correct Option is B
Solution and Explanation
Initial velocity (u) = 40 m/s
Acceleration $a = -g m/s^2 = -10 m/s^2$
Time = 2 seconds
By Ist equation of motion,
v = u + at
v = 40 - 10 (2) =20 m/s
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Concepts Used:
Motion in a straight line
The motion in a straight line is an object changes its position with respect to its surroundings with time, then it is called in motion. It is a change in the position of an object over time. It is nothing but linear motion.
Types of Linear Motion:
Linear motion is also known as the Rectilinear Motion which are of two types:
- Uniform linear motion with constant velocity or zero acceleration: If a body travels in a straight line by covering an equal amount of distance in an equal interval of time then it is said to have uniform motion.
- Non-Uniform linear motion with variable velocity or non-zero acceleration: Not like the uniform acceleration, the body is said to have a non-uniform motion when the velocity of a body changes by unequal amounts in equal intervals of time. The rate of change of its velocity changes at different points of time during its movement.