Question

A particle is constrained to move on a straight line path it returns to the starting point after $10sec$. The total distance covered by the particle during this time is $30m$. Which of the following statements about the motion of the particle is false

• A. Displacement of the particle is zero
• B. Average speed of the particle is $3m/s$
• C. Displacement of the particle is $30m$
• D. Both $\left(A\right)$ and $\left(B\right)$

Answer 1

The correct option is D

Both $\left(A\right)$ and $\left(B\right)$

Since the particle comes to the starting point, its displacement is zero.

The average speed of the particle is,

$$\begin{gathered} V_a=totaltime/totaldis\tan ce \\ {V}_a=\frac{30}{10} \\ {V}_a=3m/s \end{gathered}$$

Hence, the Displacement of the particle is zero and the Average speed of the particle is $3m/s$.

Hence. Option D is the correct answer.