Question

A bus initially at rest accelerates uniformly with an acceleration of 10m/s square what is the speed of the bus at the end of 20 seconds

Answer 1

Answer:

a=v/t

10=v/20

v=200m/s

Answer 2

GIVEN:

• Initial Velocity (u) of bus = 0 m/s
• Acceleration (a) = 10 m/s²
• Time taken(t) by the bus = 20 seconds

TO FIND:

• What is the speed/Final Velocity of the bus ?

SOLUTION:

Let the speed/Final Velocity of the bus be 'v' m/s

To find the speed/ Final Velocity of the bus, we use the First equation of motion

$\large\bf{\star \: v = u + at\: \star}$

According to question:-

On putting the given values in the formula, we get

$\rm{\dashrightarrow v = 0 + 10 \times 20 }$

$\rm{\dashrightarrow v = 0 + 200 }$

$\bf{\dashrightarrow \star \: v = 200 \: m/s \: \star}$

❍ v = speed/Final Velocity = 200 m/s

❝ Hence, the speed/ Final Velocity of the bus is 200 m/s ❞

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Extra Information

➺ Second equation of motion = s = ut + 1/2 at²

➺ Third equation of motion = v² - u² = 2as