An object starting from rest travels 20 , m i | vedclass

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(D) Given that the object starts from rest,initial velocity $u = 0 \, m/s$.For the first $2 \, s$,distance $s_1 = 20 \, m$ and time $t_1 = 2 \, s$.Usi

Vedclass · Accepted Answer

$70$

Vedclass · Answer

(D) Given that the object starts from rest,initial velocity $u = 0 \, m/s$.For the first $2 \, s$,distance $s_1 = 20 \, m$ and time $t_1 = 2 \, s$.Using the equation of motion $s = ut + \frac{1}{2}at^2$:$20 = 0(2) + \frac{1}{2} a(2)^2 \Rightarrow 20 = 2a \Rightarrow a = 10 \, m/s^2$.Since the acceleration is constant,we can calculate the velocity at any time $t$ using $v = u + at$.For $t = 7 \, s$:$v = 0 + (10 	imes 7) = 70 \, m/s$.

An object starting from rest travels $20 \, m$ in the first $2 \, s$ and $160 \, m$ in the next $4 \, s$. What will be the velocity after $7 \, s$ from the start (in $, m/s$)?

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