Let $\vec v$ and $\vec a$ denote the velocity and acceleration respectively of a body in one-dimensional motion
Let $\vec v$ and $\vec a$ denote the velocity and acceleration respectively of a body in one-dimensional motion
- A
$|\vec v|$must decrease when $\vec a < 0$
- B
Speed will decrease when $|\vec v| < 0 $ and $\vec a$ are $< 0$
- C
Speed will increase when both $|\vec v|$ and $\vec a$ are $< 0$
- D
Both $(B)$ and $(C)$
Similar Questions
A particle starts from origin at $t=0$ with a velocity $5 \hat{i} \mathrm{~m} / \mathrm{s}$ and moves in $x-y$ plane under action of a force which produces a constant acceleration of $(3 \hat{i}+2 \hat{j}) \mathrm{m} / \mathrm{s}^2$. If the $x$-coordinate of the particle at that instant is $84 \mathrm{~m}$, then the speed of the particle at this time is $\sqrt{\alpha} \mathrm{m} / \mathrm{s}$. The value of $\alpha$ is___________.
- [JEE MAIN 2024]
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