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Derivation of Velocity-Time Relation by Graphical Method

A space craft...

Question

A space craft flying in a straight course with a velocity of $75 k m s^{- 1}$ fires its rocket motors for $60 s$ . At the end of this time its speed is $120 k m s^{- 1}$ in the same direction. Find the acceleration in the last $50 s$ .

A

0.9 k m s^{- 2}

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B

0.4 k m h r^{- 2}

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C

0.9 m s^{- 2}

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D

4 m s^{- 2}

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Solution

The correct option is A $0.9 k m s^{- 2}$

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Derivation of Velocity-Time Relation by Graphical Method

Standard IX Physics

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