NCERT Solutions for Chapter: Motion in a Straight Line, Exercise 1: MCQ-I

Among the four graphs given below, there is only one graph for which average velocity over the time interval $(0, T)$ can vanish for a suitably chosen $T$. Which one is it?

A lift is coming from $8^{th}$ floor and is just about to reach $4^{th}$ floor. Taking ground floor as Origin and positive direction upwards for all quantities, which one of the following is correct?

In one-dimensional motion, instantaneous speed $v$ satisfies $0\le \mathbf{v}<{\mathbf{v}}_{\mathbf{0}}$.

A vehicle travels half the distance $L$ with speed $v_1$ and the other half with speed $v_2$, then its average speed is

The displacement of a particle is given by $x=(t-2{)}^2$ where $x$ is in meters and $t$ in seconds. The distance covered by the particle in first $4$ second is:

At metro station, a girl walks up a stationary escalator in time $t_1$. If she remains stationary on escalator, then the escalator take her up in time $t_2$. The time taken by her to walk up on the moving escalator will be: