In the blink of an eye
Classical Mechanics
Level
2
Top cricket bowlers can bowl the ball at speeds of 150 kilometers per hour. How long in seconds does a batsman have to react to a ball before it's past him?
Details and assumptions
- The length of a cricket pitch is approximately 20 m.
The answer is 0.48.
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1 solution
The speed of the ball in m/s is 41.67 m/s. Since we have x = v t → 2 0 = 4 1 . 6 7 t , we can solve for t = 0 . 4 8 seconds.