Physics Test: Practice Questions On Velocity And Acceleration!

The given equation for speed, which is speed = distance/time, indicates that speed can be calculated by dividing the distance traveled by the time taken. Therefore, the correct answer is "distance."

A position describes an object's location compared to a reference point. This means that the position of an object is determined by its distance and direction from a fixed point of reference. The reference point serves as a starting point or a frame of reference to measure the object's position. By comparing the object's location to this reference point, we can determine its position accurately.

The cheetah's acceleration can be calculated by dividing the change in velocity by the time taken. In this case, the change in velocity is 20 m/s (final velocity) minus 0 m/s (initial velocity), which equals 20 m/s. The time taken is 2 seconds. Dividing the change in velocity by the time taken gives us an acceleration of 10 m/s.

When a car slows down from 40 m/s to 20 m/s, its velocity decreases. Since acceleration is defined as the rate of change of velocity, and the velocity is decreasing, the car is experiencing negative acceleration. Negative acceleration is also known as deceleration, which means the car is slowing down. Therefore, the correct answer is negative acceleration.

The swimmer increases her speed as she approaches the end of the pool, indicating that her velocity is increasing. Since acceleration is the rate of change of velocity, and the swimmer's velocity is increasing, her acceleration must also be in the same direction as her motion.

Velocity is a term used to describe the speed of an object in a specific direction. It is a vector quantity that includes both magnitude (speed) and direction. Unlike speed, which only refers to how fast an object is moving, velocity takes into account the direction of motion as well. Therefore, the given answer "velocity" accurately describes the concept of speed in a specific direction.

Maria walked 2 km in half an hour. To find her average speed, we divide the total distance walked (2 km) by the total time taken (0.5 hours). 2 km divided by 0.5 hours equals 4 km/h. Therefore, her average speed during her walk was 4 km/h.

Since Mary and Keisha are running in opposite directions, their velocities will be different. Velocity is a vector quantity that includes both speed and direction. Even though they have the same constant speed, their velocities will be different because they are moving in opposite directions. Therefore, the correct answer is "different velocities".