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Grade:
        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

Answers : (4)

Monil Shah
34 Points
							

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
Pallavi
17 Points
							
It is wrong................................?....................................................................
3 years ago
prateek
14 Points
							
Let A be the point of origin .Then,
Coordinate of x= 40 and coordinate of y =-20
And angle =0°
Thus using equation for path of trajectory we get ,
Y= tan θ x- gx /2(ucos
one year ago
prateek
14 Points
							
 
Let A be the point of origin .Then,
Coordinate of x= 40 and coordinate of y =-20
And angle =0°
Thus using equation for path of trajectory we get ,
Y= tan θ x- gx /2(ucos theta)2
-20= -1000(40)2/2u2
U= 1000(40)
U=200m/s or 2m/s
Hence the minimum velocity wil be2m/s
one year ago
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