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2.Motion in Straight Line
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A juggler maintains four ball in vertically upward motion. He attempts next ball after $1/4\, sec$. For the shows to go on, what should be the height for which he throws the ball ?.........$m$ $(g=10\,m/s^2)$
A
$5$
B
$2.5$
C
$1.25$
D
$1$
Solution
time $=\frac{1}{4}+\frac{1}{4}=\frac{1}{2} \sec$
$S=u t+\frac{1}{2} a t^{2}$
$S=\frac{1}{2} g t^{2}$
$S=\frac{1}{2} \times 10 \times\left(\frac{1}{2}\right)^{2}$
$S=\frac{1}{2} \times 10 \times \frac{1}{4}$
$=\frac{10}{8}$
$1.25 \mathrm{m}$
Standard 11
Physics
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