Question

an obect starting from rest travels 20m in first 2 secs and 160m in nexr 4 secs. what will be tge velocity after 7 secs from the starts​

Answer 1

u=0

s1 = 20 m

s2 = 160 m

t1 = 2 seconds

t2 = 4 seconds

s = 20+160= 180 m

t = 2+4 = 6 seconds

s = ut + 1/2at²

180 = 0×6 + 1/2×a×6²

180 = 18a

a = 180/18

= 10m/s²

t = 7 seconds

v = u + at

= 0 + 10×7

= 70 m/s

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