A) 3 m/s
B) 5 m/s
C) 4 m/s
D) None of these
Correct Answer: C
Solution :
\[s=13.8t-4.9{{t}^{2}}\] Its velocity \[v=\frac{ds}{dt}=13.8-9.8t\] Hence \[{{\left( \frac{ds}{dt} \right)}_{t=1}}=13.8-9.8\times 1=4.0=4m/\sec .\]You need to login to perform this action.
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