Aball is thrown vertically upwards at 19.6 m/s. For its complete the and back down to the starting position), its average speed is: A. 19.6 m/s. B. 9.8 m/s. C. 6.5 m/s. D.4.9 m/s.
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abc and bde are two equalateral triangles such that d is the mid point of bc if bd:dc =2:1 then the ratio of the area of ∆abc to that of ∆bde is
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