Understanding Acceleration and Speed

The video tutorial explains the decrease in speed of a bus from 80 km/h to 60 km/h, converting these speeds into meters per second. It then demonstrates how to calculate acceleration using the first equation of motion and explains the concept of retardation as negative acceleration.

What was the initial speed of the bus?

• 120 km/h

• 60 km/h

• 100 km/h

• 80 km/h

What was the final speed of the bus?

• 70 km/h

• 60 km/h

• 80 km/h

• 50 km/h

What is the conversion factor from km/h to m/s?

• 0.18

• 0.28

• 0.48

• 0.38

What is the initial speed in m/s after conversion?

• 20.0 m/s

• 16.6 m/s

• 18.5 m/s

• 22.22 m/s

What is the final speed in m/s after conversion?

• 22.22 m/s

• 20.0 m/s

• 18.5 m/s

• 16.6 m/s

Which formula is used to calculate acceleration?

• s = ut + 0.5at^2

• v = u + at

• v^2 = u^2 + 2as

• a = (v - u) / t

What is the calculated acceleration in m/s²?

• -1.12 m/s²

• 1.12 m/s²

• 2.5 m/s²

• -2.5 m/s²

Why is the acceleration negative?

• Time is negative

• Speed is decreasing

• Distance is negative

• Speed is increasing

What is another term for negative acceleration?

• Momentum

• Velocity

• Deceleration

• Acceleration