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Cool goIITian

Joined:	24 Jul 2009
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10 Aug 2009 13:37:47 IST

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A ball rolls of the top of a stairway with a horizontal velocity of 1.8 m/s . the steps are 0.20m

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A ball rolls of the top of a stairway with a horizontal velocity of 1.8 m/s . the steps are 0.20m high and 0.20 m wide . which step will ball hit first?

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aal izz well

Blazing goIITian

Joined: 6 Jun 2009

Posts: 409

10 Aug 2009 13:41:44 IST

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hcv ka question..i think...

Soumen Goswami

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Joined: 10 Apr 2007

Posts: 1777

12 Aug 2009 22:19:50 IST

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Take the edge of the topmost step as the origin. Write the equation of trajectory for the ball. Next, connect the edges of all the stairs. You'll see that this line forms an angle 45 with the horizontal. Its equation will be y = -x. Find the intersection point of this line and the particle's path. From the intersection point, you can count the no. of stairs

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