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A ball rolls off a platform of height 1.8m at a horizontal speed of 15 ms−1. How far off the edge of the platform does it land?

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S = ½ gt2  
1.8m = ½ x 10ms−1 x t2
t= 0.36s2
t = 0.6s   
s = vt      
   = 15m s−1 x 0.6s =9m 

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