Question

A body moves with a uniform speed and covers a distance of 20 meters in 2 seconds and 30 meters in the next 3 seconds. What is it's average speed

Answer 1

Answer

Average Speed is 10 m/s

Given

• A body moves with a uniform speed and covers a distance of 20 meters in 2 seconds and 30 meters in the next 3 seconds

To Find

• Average Speed

Solution

Distance , D₁ = 20 m

Time , T₁ = 2 s

⇒ Speed = Distance / Time

⇒ S₁ = 20 / 2 = 10 m/s

Distance , D₂ = 30 m

Time , T₂ = 3 s

⇒ S₂ = 30 / 3

⇒ S₂ = 10 m/s

Average speed is defined as , " Total distance covered per total time "

⇒ As = D₁ + D₂ / T₁ + T₂

⇒ As = 20 + 30 / 2 + 3

⇒ As = 50 / 5

⇒ As = 10 m/s

( or )

As = ( 2 * S₁ * S₂ ) / ( S₁ + S₂ )

⇒ As = ( 2 * 10 * 10 ) / ( 10 + 10 )

⇒ As = 200 / 20

⇒ As = 10 m/s