Question

A body moves with a uniform acceleration of 3 metre per second square. After 10 seconds its velocity became 15 metre per second find the initial velocity of the body.​

Answer 1

Explanation:

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Answer 2

Answer:

$\bigstar{\bold{Initial\:velocity=-15\:m/s }}$

Explanation:

$\Large{\underline{\underline{\bf{Given:}}}}$

• Acceleration ( a ) = 3 m/s²
• Final velocity ( v ) = 15 m/s
• Time taken ( t ) = 10 s

$\Large{\underline{\underline{\bf{To\:Find:}}}}$

• Initial velocity ( u )

$\Large{\underline{\underline{\bf{Solution:}}}}$

→ By the first equation of motion,

  v = u + at

→ Substitute the datas,

  15 = u + 3 × 10

  15 = u + 30

  u = 15 - 30

 u = -15 m/s

 u = -15 m/s

$\boxed{\bold{Initial\:velocity=-15\:m/s }}$

→ The initial velocity is negative since the body was moving in the downward direction or in the opposite direction.

$\Large{\underline{\underline{\bf{Notes:}}}}$

→ The three equations of motion are :

• v = u + at
• s= ut + 1/2 × a × t²
• v² - u² = 2as