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Standard IX

Physics

Velocity

A fighter pla...

Question

A fighter plane was travelling at $100 m s^{- 1}$ . Then a retardation of $5 m s^{- 2}$ is applied. In what time will the plane slow down to $50 m s^{- 1}$ ?

40 s

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30 s

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20 s

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10 s

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Solution

The correct option is D $10 s$

Initial velocity $(u) = 100 m s^{- 1}$
Final velocity $(v) = 50 m s^{- 1}$
Retardation $= 5 m s^{- 2}$
Now, retardation $= \frac{u - v}{t} = \frac{100 - 50}{t}$
$∴$ $5 = \frac{50}{t}$
or, $t = \frac{50}{5} = 10 s$

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A fighter plane was travelling at 100ms−1. Then a retardation of 5ms−2 is applied. In what time will the plane slow down to 50ms−1?

The correct option is D 10sInitial velocity (u)=100ms−1Final velocity (v)=50ms−1Retardation =5ms−2Now, retardation =u−vt=100−50t∴ 5=50tor, t=505=10s

A fighter plane was travelling at $100 m s^{- 1}$ . Then a retardation of $5 m s^{- 2}$ is applied. In what time will the plane slow down to $50 m s^{- 1}$ ?

The correct option is D $10 s$

Initial velocity $(u) = 100 m s^{- 1}$
Final velocity $(v) = 50 m s^{- 1}$
Retardation $= 5 m s^{- 2}$
Now, retardation $= \frac{u - v}{t} = \frac{100 - 50}{t}$
$∴$ $5 = \frac{50}{t}$
or, $t = \frac{50}{5} = 10 s$