If a baseball pitcher throws a ball horizontally, at a speed of $72 k m h^{- 1}$ , how long does the ball take to reach the batter $20 m$ away?

1 s

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2 s

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3 s

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4 s

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Solution

The correct option is A 1 s
To calculate the time that the ball takes to reach the batter, we need its speed and distance because,

Speed = $\frac{Distance}{Time}$

But here speed is given in km/hr and distance in m, so, we need to convert all units to SI units.

1 km = 1000 m
1 hr = 3600 s

$\frac{72 km}{1 hr}$ = $\frac{72000 m}{3600 s}$ = $20 m s^{- 1}$

Speed = $20 m s^{- 1}$
Distance = $20 m$
So, time taken to cover $20 m$ distance at a speed of $20 m s^{- 1}$ will be 1 s.

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If a baseball pitcher throws a ball horizontally, at a speed of 72 kmh−1, how long does the ball take to reach the batter 20 m away?

If a baseball pitcher throws a ball horizontally, at a speed of $72 k m h^{- 1}$ , how long does the ball take to reach the batter $20 m$ away?