Question
When the velocity of body is variable, then
✓
Answer
(d)
If velocity is changing they may change in magnitude or direction or both.
$(i)$ So, if velocity is changing in direction only the magnitude is constant so speed is constant.
$(ii)$ If only direction of velocity is changing and magnitude is constant then acceleration will also be constant in magnitude (in case of uniform circular motion).
$(iii)$ Average acceleration may be constant. $a_{ av }=\frac{v_2-v_1}{t_2-t_1}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
At what temperature will the resistance of a copper wire become three times its value at $0\,^oC$ ................. $^oC$ (Temperature coefficient of resistance for copper = $4 × 10^{-3} \,per\, \,^oC$ )
→Two objects are projected with same velocity ' $u$ ' however at different angles $\alpha$ and $\beta$ with the horizontal. If $\alpha+\beta=90^{\circ}$, the ratio of horizontal range of the first object to the $2^{\text {nd }}$ object will be :
→Photoelectrons are ejected from a metal when light of frequency $v$ falls on it. Pick out the wrong statement from the following
→A convex lens $A$ of focal length $20 cm$ and a concave lens $B$ of focal length $5 cm$ are kept along the same axis with the distance $d$ between them. If a parallel beam of light falling on $A$ leaves $B$ as a parallel beam, then distance $d$ in $cm$ will be
→The first overtone frequency of an open organ pipe is equal to the fundamental frequency of a closed organ pipe. If the length of the closed organ pipe is $20 \,cm$. The length of the open organ pipe is........$cm$.
→$A$ thin prism of angle $5^o$ is placed at a distance of $10\,cm$ from object. What is the distance of the image from object? (Given $\mu$ of prism $= 1.5$)
→The figure shows a network of resistances in which the point $A$ is earthed. The current through the $3\,\Omega$ resistor is
→The centripetal force acting on a satellite orbiting round the earth and the gravitational force of earth acting on the satellite both equal $F$. The net force on the satellite is
→An electron in a hydrogen atom makes a transition from $n_1$ to $n_2$. If the time period of electron in the initial state is eight times that in the final state then
→In the circuit shown in the adjoining figure, the reading of ammeter $A$ is ................ $\mathrm{A}$
→