Which one of the following statements is wron | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) $1$. Option $A$ is correct: At the highest point of a vertical throw,velocity is $0$ but acceleration is $g$ (downwards).$2$. Option $B$ is wrong:

Vedclass · Accepted Answer

$A$ body can have a constant velocity and still have a varying speed.

Vedclass · Answer

(B) $1$. Option $A$ is correct: At the highest point of a vertical throw,velocity is $0$ but acceleration is $g$ (downwards).$2$. Option $B$ is wrong: Velocity is a vector quantity defined as $\vec{v} = \vec{v}_{avg} = \frac{\Delta \vec{r}}{\Delta t}$. If velocity is constant,both its magnitude (speed) and direction must remain constant. Therefore,a body with constant velocity cannot have varying speed.$3$. Option $C$ is correct: In uniform circular motion,the speed is constant,but the direction of velocity changes continuously,so velocity is varying.$4$. Option $D$ is correct: In projectile motion,the acceleration is constant ($g$ downwards),but the direction of velocity changes continuously.

Column $I$	Column $II$
$(A)$ Change in velocity	$(p)$ $-5/3\,SI \text{ unit}$
$(B)$ Average acceleration	$(q)$ $-20\,SI \text{ unit}$
$(C)$ Total displacement	$(r)$ $-10\,SI \text{ unit}$
$(D)$ Acceleration at $t=3\,s$	$(s)$ $-5\,SI \text{ unit}$

Which one of the following statements is wrong?

Similar Questions

$A$ point traversed half of the distance with a velocity $v_0$. The remaining part of the distance was covered with velocity $v_1$ for half the time and with velocity $v_2$ for the other half of the time. The mean velocity of the point averaged over the whole time of motion is

$A$ particle moving in a straight line covers half the distance with speed $6 \, m/s$. The other half is covered in two equal time intervals with speeds $9 \, m/s$ and $15 \, m/s$ respectively. The average speed of the particle during the motion is: (in $ \, m/s$)

$A$ car is moving along a straight line,say $OP$ in the given figure. It moves from $O$ to $P$ in $18\; s$ and returns from $P$ to $Q$ in $6.0\; s$. What are the average velocity and average speed of the car in going from $O$ to $P$ and back to $Q?$

$A$ car moves towards north at a speed of $54 \,km/h$ for $1 \,h$. Then it moves eastward with the same speed for the same duration. The average speed and velocity of the car for the complete journey is ..........

Vedclass Test Series

Exam Paper Generator

Online Exam Module