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Grade: 12
`        A staircase has steps each of height 20cm and width 40 cm. A ball rolls off the top of the staircase horizontally with velocity 5m/s. The ball hits the nth step from the top at the first bounce, n=?a) 5 b)6 c)7 d)8`
one year ago

## Answers : (1)

Rama sai rohan
32 Points
```							Range =n×0.4Height =n×0.2Formula:R=u√(2h/g)               n×0.4=5×√(2×0.2n/g)         If we solve this we get              n=6.2 so, we take it as 6th step
```
one year ago
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