Question:
A stone dropped from the top of a tower reaches ground in 4 s. Height of the tower is $(g = 10 \, m/s^2)$
A stone dropped from the top of a tower reaches ground in 4 s. Height of the tower is $(g = 10 \, m/s^2)$
Updated On: May 12, 2024
- 20 m
- 40 m
- 60 m
- 80 m
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The Correct Option is D
Solution and Explanation
As, $h = ut + \frac{1}{2} gt^2$
Here, $u = 0 , g = 10 \, m \, s^{-2} , t = 4\,s $
$ \therefore \:\:\:\: h = 0 \times 4 + \frac{1}{2} \times 10 \times 4^2 = 80 \, m $
Here, $u = 0 , g = 10 \, m \, s^{-2} , t = 4\,s $
$ \therefore \:\:\:\: h = 0 \times 4 + \frac{1}{2} \times 10 \times 4^2 = 80 \, m $
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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.