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 7s from the start?

Question

Mayank Ranka · Answer

From s = u t + 2 1 ​ a t 2 In first 2 s, s = 2 0 m 2 0 = 2 1 ​ a ( 2 ) 2 = 2 a a = 1 0 m / s 2 Velocity at the end of 2 s is v = u + a t = 0 + 1 0 &times; 2 = 2 0 m / s In next 4s, s = u t + 2 1 ​ a &prime; t 2 1 6 0 = 2 0 &times; 4 + 2 1 ​ a &prime; ( 4 ) 2 8 0 = 8 a &prime; a &prime; = 1 0 m / s 2 It shows that acceleration is uniform. From v = u + a t v = 0 + 1 0 &times; 7 = 7 0 m / s

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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 7s from the start?

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 7s from the start?

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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 7s from the start?

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

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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 7s from the start?