Question

a car travelling with a speed of 2 metre per second increases its speed to 10 metre per second in time interval of 4 second what is acceleration of car​

Answer 1

Answer:

2 m/s²

Explanation:

Given :

• Initial velocity = u = 2 m/s
• Final velocity = v = 10 m/s
• Time = 4 seconds

To find :

• Acceleration of the car with the above information

Acceleration = (final velocity - Initial velocity) / time

So it can also be written as:

Acceleration = (v-u) / t

Acceleration = (10-2)/4

Acceleration = (8)/4

Acceleration = 2 m/s²

The acceleration of the car is equal to 2 m/s²

• Acceleration is a vector quantity
• Acceleration's unit is m/s²

Answer 2

Explanation :

Car travelling with initial speed of 2m/s increases speed to 10 m/s in 4 seconds.

What is acceleration of car?

Here,

□ Initial speed (u) = 2 m/s

□ Final speed (v) = 10 m/s

□ Time (t) = 4 seconds.

We will use 1st equation of motion :

⇒ v = u + at

⇒ 10 = 2 + a × 4

⇒ 10 - 2 = 4a

⇒ 8 = 4a

⇒ a = 8/4

⇒ a = 2 m/s²

∴ Acceleration of car = 2 ms-²

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★ Equations of motion :

⇒ v = u + at -(eq.1)

⇒ s = ut + ½ at² -(eq.2)

⇒ v² - u² = 2as -(eq.3)

When a body goes upwards,

⇒ Acceleration = Gravitational acceleration

⇒ g = -10 m/s²

When a body comes downwards,

⇒ g = 10 m/s²