A body is moving with velocity 15m/s and it travels 250m in 9seconds. Find the velocity of 9 seconds and displacement of 5th second.
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u=15
s=250
t=9
v=?
s=ut+1/2at²
250=15×9+1/2a×9²
250=135+81a/2
250-135=81a/2
115×2=81a
230/81=a
v=u+at
v=15+230/81×9
v=15+230/2
v=15+115
v=130
s= v-u
s= 130-15
s=115
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