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