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A man has the power of 90 W and mass 60 kg runs up a staircase in 40 seconds. If each step of the staircase is 20 cm high, calculate the number of steps. |
| Answer» A man has the power of 90 W and mass 60 kg runs up a staircase in 40 seconds. If each step of the staircase is 20 cm high, calculate the number of steps. | |