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Standard XII

Physics

Motion Under Gravity

A ball is thr...

Question

A ball is thrown upward from the edge of a cliff with an initial velocity of $8 m/s$ . How fast will it go at $0.5 sec$ later.
[Take $g = 10 {m/s}^{2}$ ]

2 m/s

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3 m/s

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4 m/s

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1 m/s

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Solution

The correct option is B $3 m/s$
The instant velocity at the time $0.5 sec$ from the start of the motion is given as
$v = u + a t$
$\Rightarrow v = u - g t$
$\Rightarrow v = 8 - 10 \times 0.5$
$\Rightarrow v = 3 m/s$

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A ball is thrown upward from the edge of a cliff with an initial velocity of 8 m/s. How fast will it go at 0.5 sec later. [Take g=10 m/s2]

The correct option is B 3 m/sThe instant velocity at the time 0.5 sec from the start of the motion is given as v=u+at ⇒ v=u−gt ⇒ v=8−10×0.5 ⇒ v=3 m/s

A ball is thrown upward from the edge of a cliff with an initial velocity of $8 m/s$ . How fast will it go at $0.5 sec$ later.
[Take $g = 10 {m/s}^{2}$ ]

The correct option is B $3 m/s$
The instant velocity at the time $0.5 sec$ from the start of the motion is given as
$v = u + a t$
$\Rightarrow v = u - g t$
$\Rightarrow v = 8 - 10 \times 0.5$
$\Rightarrow v = 3 m/s$