A) 3.2 J
B) 1.9J
C) 3.8 J
D) 2.5 J
Correct Answer: B
Solution :
[b] \[J=m\left( {{v}_{f}}-{{v}_{i}} \right)or\text{ }7.5\text{ }=15\left( {{v}_{f}}-0 \right)\] \[\Rightarrow {{v}_{f}}=0.5m/s\] \[\therefore ~~K=\frac{1}{2}m{{v}^{2}}=\frac{1}{2}\times 15\times {{0.5}^{2}}=1.9\operatorname{J}\]
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