A) zero
B) \[5\text{ }m/s\]
C) \[10\text{ }m/s\]
D) \[20\text{ }m/s\]
Correct Answer: B
Solution :
From equation of motion, we have \[v=u+gt\] where v is final velocity, u the initial velocity, g the acceleration due to gravity and t the time. Taking downward direction negative \[u=10+5=15m/s,\,\,g=10m/{{s}^{2}},\,\,t=2s\] \[\therefore \] \[v=15-2\times 10=-5m/s\]
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