Question

henry was given this cool toy for his birthday;he can use it to tell how fast someone is going at that moment in time. the toy must calculate the persons....
average velocity
average speed
acceleration
instantaneous speed

Answer 1

Instantaneous Speed because its happening a that moment in time or instantly. Average speed is wrong because that's the total amount of time you went and the averages of the different speeds you went. So its the last one! 

Answer 2

Answer:

Instantaneous speed

Explanation:

It is given that, Henry was given this cool toy for his birthday. He can use it to tell how fast someone is going at that moment in time. The toy must calculate the person's instantaneous speed.

Instantaneous speed of an object is defined as the speed at a particular instant. Mathematically, it is given by :

$v= \lim_{\Delta t \to 0}(\dfrac{\Delta x}{\Delta t})$

Instantaneous speed is a scalar quantity. It does not involve any direction.

So, Henry must calculate the person's instantaneous speed. Hence, the correct option is (d).