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A man has a power of 90 W and mass 60 kg runs up a staircase in 40 s. If each staircase is 20cm high find the number of steps? (physics grade 9- GRAVITATION)

A man has a power of 90 W and mass 60 kg runs up a staircase in 40 s. If each staircase is 20cm high find the number of steps? (physics grade 9- GRAVITATION)
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A man has a power of 90 W and mass 60 kg runs up a staircase in 40 s. If each staircase is 20cm high find the number of steps? (physics grade 9- GRAVITATION)

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User WhiteShadow
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I showed my working in the images above. if you have any questions please feel free to ask
A man has a power of 90 W and mass 60 kg runs up a staircase in 40 s. If each staircase-example-1
A man has a power of 90 W and mass 60 kg runs up a staircase in 40 s. If each staircase-example-2
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User BoxOfNotGoodery
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