Question

The height, y metres, of an object projected directly upwards from the ground can
be modelled by y = 20t − 5t^2, where t is the time in seconds after it leaves the
ground. [4]
(i). Find the height of the object 2 seconds after it leaves the ground.
(ii). When will the object be 15 m above the ground?

Tolong jawab I need this quick

Answer 1

Answer:

11 metres

Step-by-step explanation:

124 minutes

Dont know that's why