Class 9

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Q1.

$A$ stone is thrown in a vertically upward direction with a velocity of $5 \, m s^{-1}$. If the acceleration of the stone during its motion is $10 \, m s^{-2}$ in the downward direction,what will be the height attained by the stone and how much time will it take to reach there?

(A)

$t=1 \, s; s=1.25 \, m$

(B)

$t=0.5 \, s; s=2.25 \, m$

(C)

$t=1 \, s; s=2.5 \, m$

(D)

$t=0.5 \, s; s=1.25 \, m$

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Q2.

An athlete completes one round of a circular track of diameter $200\, m$ in $40\, s$. What will be the distance covered and the displacement at the end of $2\, min$ $20\, s$?

(A)

$Distance\, covered=2200\,m;\, Displacement=200\,m$

(B)

$Distance\, covered=\frac{4400}{7}\,m;\, Displacement=200\,m$

(C)

$Distance\, covered=\frac{4400}{7}\,m;\, Displacement=100\,m$

(D)

$Distance\, covered=2200\,m;\, Displacement=100\,m$

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