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Please help me with Q6

Answer»

Very EASY!!
u=0
h=20 m
g=10 m/s^2
v=?
t=?
2gh = v ^{2}  - u ^{2}  \\ 2 \times 10 \times 20 = v  ^{2}  \\ v = 40 \:
v \:  = u + gt \\ 20 = 0 + 10t \\ t = 2 \: sec



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