Question

answer the question with explanation and I'll mark you as a brainliest and if you answer me with random things I'll report you :)

Answer 1

Answer:

• Initial Velocity₁ = 0 m/s
• Final Velocity₁ = 20 m/s
• Time₁ = 3.5 sec
• Acceleration = ?
• Time₂ = 1.5 sec
• Initial Velocity = 0 m/s
• Final Velocity ₂ = ?

$\displaystyle\underline{\bigstar\:\textsf{According to the given Question :}}$

• The Acceleration of the car can be found with the help of the first equation of motion as we are given the initial velocity, final velocity and the time taken!!

$\displaystyle\sf :\implies v = u+at$

$\displaystyle\sf :\implies 20 = 0+a\times 3.5$

$\displaystyle\sf :\implies 20 = 3.5a$

$\displaystyle\sf :\implies \dfrac{20}{3.5} = a$

$\displaystyle\sf :\implies\underline{\boxed{\textsf{ \textbf{Acceleration = 5.8 m/s}}\sf {}^{2}}}$

• So in case 2 we are given that the initial velocity is 0 m/s again whereas now the time is 1.5 sec with an acceleration of 5.8 m/s². So then we shall find the final velocity with the first equation of motion again!!

$\displaystyle\sf \dashrightarrow v = u+at$

$\displaystyle\sf \dashrightarrow v = 0+5.8\times 1.5$

$\displaystyle\sf \dashrightarrow\underline{\boxed{\textsf{ \textbf{Final Velocity = 8.7 m/s}}}}$

Know More

➝ s = ut+½at²

➝ v²-u² = 2as