The motion of stone thrown up vertically is given by \[s=13.8t-4.9{{t}^{2}}\], where s is in metre and t is in seconds. Then its velocity at \[t=1\] second is

The motion of stone thrown up vertically is given by \[s=13.8t-4.9{{t}

1.	The motion of stone thrown up vertically is given by \[s=13.8t-4.9{{t}^{2}}\], where s is in metre and t is in seconds. Then its velocity at \[t=1\] second is
A.	3 m/s
B.	5 m/s
C.	4 m/s
D.	None of these
Answer» D. None of these

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The motion of stone thrown up vertically is given by \[s=13.8t-4.9{{t}^{2}}\], where s is in metre and t is in seconds. Then its velocity at \[t=1\] second is

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