Question

an object starting from rest travels 30m distance in first 2second and next 240m in next 4second. what will be the velocity after 7second from the rest ?​

Answer 1

s = 1/2 at²

30 = 1/2 ×a × 2²

60= a × 4

a= 15 m/s²

v = u + at

v = 0 + 15 × 2

v = 30 m/s

s' = v + 1/2 a't²

240 = 30 + 1/2 a' 4²

210 = 1/2 a' 16

210 = a' × 8

a' = 210/ 8

a' = 26.25 m/s²

v' = u + a't

v' = 0 + 26.25 × 7

v' = 183.75 m/ s

Answer 2

v = 30 m / s

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