Question

For this question how can I found how high is it initially? and when is the object is at highest?

Answer 1

amorfide can you help me

Answer 2

and when it hits the ground?

Answer 3

treat it as a quadratic like you would factorise
i don't think it factorises
substitute into the formula
-b +/ sqrtb^2-4ac / 2a

Answer 4

this is just my opinion. not too sure with mechanics sorry

Answer 5

its kk..

Answer 6

the initial time means t = 0
when it reaches the highest point==> use the formula 4ab - b^2/4a

Answer 7

so here y=7

Answer 8

and when does it hits the ground?

Answer 9

it hits the ground when y = 0