Question

Acob is on the roof the school launching a model rocket. The height of the rocket, h(t),in metres, at any time, t, in seconds, is modelled by the function: h(t)=-5t2+15t+20 What is the starting height of the rocket?

Answer 1

Step-by-step explanation:

h(t)=-5t2+15t+20. intially the rocket was at rest therefore you should take time a zero

h(t)=-5t2+15t+20. t=0

h(t)=-5(0)2+15(0)20

h(t)=-20 m

>> the rocket is at 20m intially( at rest)