6.
using 2nd equation of motion
h = vt - 0.5 gt^2
since initial and final points are equal so
h = 0
0 = 15 * 20 - 0.5* g * 20^2
g = 1.5 m/s^2
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plz post other problem separately
Comment before rate in case any doubt, will reply for sure.. goodluck
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