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shivanshi asthana Grade: 11
        

a ball rolls horizontally off the top of a stairway with a speed of 1.52m/s . the steeps are 20.3m high and 20.3 m wide which step does the ball hit first?

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear shivanshi


its a question of projectile motion


initial velocity of ball is 1.52 m/sec in horizontal direction


the steeps are 20.3m high


 time take to fall this distance is


  h= 1/2gt2


 20.3 =1/2 *10 *t2


 t= 2.015 sec


in this time horizontal distane travell = 1.52 * 2.015 =3.063 m


since distance is less than 20.3  so ball hit the first step


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Badiuddin

7 years ago
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