4. Han's younger sister is riding her tricycle in a straight line. After 3 s, her speed is 0.5 m/s. After 5 s, her speed is 1.5 m/s. What is her acceleration during this time?

Han's younger sister accelerated at a rate of 0.5 meters per square second during that time.

Step-by-step explanation:

Let suppose that Han's younger sister accelerates at constant rate, then, acceleration (), measured in meters per square second, can be calculated by the following equation:

Where:

, - Initial and final times, measured in seconds.

, - Initial and final speeds, measured in meters per second.

If we know that , , and , the acceleration of the younger sister is:

Han's younger sister accelerated at a rate of 0.5 meters per square second during that time.

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