Motion calculations

What is the most correct definition for the term "motion"?

• When an object changes its position without time passing.

• When an object changes its position with respect to time.

• When an object changes its speed with respect to time.

• When an object starts to accelerate from a stationary position.

Which of the following is a vector quantity?

• Speed
• Distance
• Time
• Velocity

Convert 0.55 km to m (don't include units in answer)

A student walks 2 km north from their house to a park, then walks 2 km back. What is the total distance travelled?

• 2 km
• 4 km
• 0 km
• 1 km

A student walks 2 km north from their house to a park, then walks 2 km back. What is the total distance travelled?

• 2 km
• 4 km
• 0 km
• 1 km

A student walks 2 km north from their house to a park, then walks 2 km back. What is the total displacement?

• 2 km
• 4 km
• 0 km
• 1 km

How would you calculate the average speed of a cheetah that runs a distance of 75 meters in only 3 seconds?

• 75 ÷ 3

• 75 × 3

• 3 ÷ 75

• 3 + 75

How would you calculate the distance a motorcyclist travels if he rides at a speed of 20 m/s for 500 seconds?

• 20 ÷ 500

• 20 × 500

• 500 ÷ 20

• 500 + 20

A motorbike goes from stationary to 25m/s in 10 sec. What is the acceleration of the motorbike?

• 2.5 m/s²

• -2.5 m/s²

• 2.5 km/h²

• 0.4 m/s²

A car slows down from 14m/s to 7m/s in 5 secs. What is the deceleration of the car?

• -1.4m/s²

• 1.4m/s²

• -0.71m/s²

• 0.71m/s²