If $x \propto {t^{5/2}}$ , then
If $x \propto {t^{5/2}}$ , then
- A
$v \propto {t^{3/2}}$
- B
$a \propto \sqrt t $
- C
both$ (A)$ and $(B)$
- D
$v \propto \sqrt t $
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A body $A$ starts from rest with an acceleration $a_1$ . After $2\ seconds$ , another body $B$ starts from rest with an acceleration $a_2$ . If they travel equal distance in the $5th\ second$ , after the start of $A$ , then the ratio $a_1$ : $a_2$ is equal to
$Assertion$ : A body can have acceleration even if its velocity is zero at a given instant of time.
$Reason$ : A body is numerically at rest when it reverses its direction.
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$Reason$ : A body is numerically at rest when it reverses its direction.
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