The position of a ball as a function of time is given by
x=3.0m+(−5.0m/s)t
what is the position of the ball at 1.9 s ?

x = -6.5 meters

Explanation:

The position of a ball as a function of time t is given by :

..................(1)

Where t is time in seconds

We need to find the position of the ball at 1.9 s. It can be simply calculated putting t = 1.9 s in equation (1) as :

x = -6.5 meters

So, the position of the ball at 1.9 seconds is -6.5 meters. Hence, this is the required solution.

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from wikipedia