Question:
A boy of $50\, kg$ is standing in a left moving down with acceleration $ 9.8\,m/s^{2}$ . The apparent weight of the boy is:
A boy of $50\, kg$ is standing in a left moving down with acceleration $ 9.8\,m/s^{2}$ . The apparent weight of the boy is:
Updated On: Jul 2, 2022
- $ \frac{50}{9.8}N $
- $ 50\times 9.8\,N $
- $50\, N$
- zero
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The Correct Option is D
Solution and Explanation
Mass of the boy $m=50$
Acceleration of lift (downwards)
$a=9.8\, m / s ^{2}$
The apparent weight of the boy when the lift is moving downwards
$w=m(g-a)=50(9.8-9.8)=0$
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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.