A) \[42.84\text{ }J\]
B) \[52.84\text{ }J\]
C) \[62.84\text{ }J\]
D) \[72.84\text{ }J\]
Correct Answer: C
Solution :
As there is no air resistance and gravitatitfhal force is a conservative force, we can apply mechanical energy conservation. \[\Rightarrow \] \[{{(KE)}_{f}}={{(KE)}_{i}}+Change\,\,in\,\,PE\] \[=\frac{1}{2}m{{V}^{2}}+mgh\] \[=\frac{1}{2}\times 4\times {{(2.2)}^{2}}+4\times (9.8)\times (1.3)\] \[=9.68+50.96\] \[=60.64\approx 62.84\,\,J\]You need to login to perform this action.
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