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`        a staircase contains three steps each 10 cm high and 20 cm wide.what should be the minimum horizontal velocity of a ball rolling off the uppermost plane so as to hit directly the lowest plane`
7 years ago

```							The speed should be 10root6. First see max height is 30 cm.now use s=half*g*t(square)
Now divide the distance 60 cm(horizontal range ) by time you get.
The concept is that for max height no initial velocity so get time and for horizontal motion speed is uniform so divide by time to get speed
```
7 years ago
```							It is wrong................................?....................................................................
```
3 years ago
```							Let A be the point of origin .Then,Coordinate of x= 40 and coordinate of y =-20And angle =0°Thus using equation for path of trajectory we get ,Y= tan θ x- gx2  /2(ucos
```
one year ago
```							 Let A be the point of origin .Then,Coordinate of x= 40 and coordinate of y =-20And angle =0°Thus using equation for path of trajectory we get ,Y= tan θ x- gx2  /2(ucos theta)2-20= -1000(40)2/2u2U2 = 1000(40)U=200m/s or 2m/sHence the minimum velocity wil be2m/s
```
one year ago
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