A box is tossed upward from a cliff that is 15 meters high, at a speed of 4 meters per second. The height of the box is given in meters by h (t) = -4.9t^2+4t+15 where t is seconds. What is the height of the box at 1 second?

14.1m above the sea level.

Step-by-step explanation:

h (t) = -4.9t²+4t+15, t in seconds

When t=0s, h (0) = 15m (height of cliff), so it means that h is measured from the sea level.

After 1 second: h (1) = -4.9+4+15=14.1m above the sea level.