What is the best description of the acceleration of an object?

Question

Question 9 options:

A runner travels 100 m in one minute.

A car's velocity changes from 25 m/s to 20 m/s in 5 seconds.

An airplane changes elevation from 10,000 ft to 5,000 ft.

A remote-control car speeds up from 0 m/s to 15 m/s.

Answer 1

The best description of acceleration from the options provided is:

A remote-control car speeds up from 0 m/s to 15 m/s.

This is because acceleration is defined as the rate of change of velocity over time, specifically indicating how quickly an object is changing its speed. In this example, the remote-control car is experiencing a change in velocity from a standstill (0 m/s) to a faster velocity (15 m/s), which clearly illustrates the concept of acceleration.