An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the velocity after 7 s from the start.

Answer:

Here object starts from rest hence

  • Initial velocity (u) = 0
  • t = 2s
  • s = 20 m

According to Second equation of motion

s = ut + 1/2 at2

s = 0 + 1/2 × a × 22

20 = 1/2 × a × 22

20 = 1/2 × a × 4

20 = 2a

a = 10 m/s

According to first equation of motion velocity after 7 s from the start

v = u + at

v = 0 + 10 × 7

v = 70 m/s

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