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Standard XI

Physics

Distance traveled in nth second

A man in a ba...

Question

A man in a balloon, throws a stone downwards with a speed of $4 m/s$ with respect to balloon. If the balloon is moving upwards with a constant acceleration of $2 {m/s}^{2}$ , then speed of the stone relative to the man after $3 seconds$ is

43 m/s

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10 m/s

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40 m/s

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15 m/s

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Solution

The correct option is C $40 m/s$
Answer (2)
$u_{r e l} = + 4 (taking downward positive)$
$a_{r e l} = 10 - (- 2) = 12 {ms}^{- 2}$
$v_{r e l} = 4 + 12 \times 3 = 40 {ms}^{- 1}$

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A man in a balloon, throws a stone downwards with a speed of 4 m/s with respect to balloon. If the balloon is moving upwards with a constant acceleration of 2 m/s2, then speed of the stone relative to the man after 3 seconds is

The correct option is C 40 m/s Answer (2) urel=+4 (taking downward positive) arel=10−(−2)=12 ms−2 vrel=4+12×3=40 ms−1

A man in a balloon, throws a stone downwards with a speed of $4 m/s$ with respect to balloon. If the balloon is moving upwards with a constant acceleration of $2 {m/s}^{2}$ , then speed of the stone relative to the man after $3 seconds$ is

The correct option is C $40 m/s$
Answer (2)
$u_{r e l} = + 4 (taking downward positive)$
$a_{r e l} = 10 - (- 2) = 12 {ms}^{- 2}$
$v_{r e l} = 4 + 12 \times 3 = 40 {ms}^{- 1}$