A) 1.5 s
B) 4.025 s
C) 5.4 s
D) 6.75 s
Correct Answer: C
Solution :
\[h=ut+\frac{1}{2}g{{t}^{2}}\]\[\Rightarrow 81=-12t+\frac{1}{2}\times 10\times {{t}^{2}}\Rightarrow t=5.4\,sec\]
You need to login to perform this action.
You will be redirected in
3 sec
