Answer:
(a) D(t)= -4.9 t^2 + vt
(b) 10 sec
(c) 122.5m
(d) At t= 4sec, v= 9.8m/s (upwards) and at t= 9sec, v= 39.2m/s (downwards)
(e) -24.5m
(f) -49m/s (i.e. downwards)
(g) 0
Step-by-step explanation:
(b) Time in the air = 2v/g = 10sec
(c) Maximum height = 
=122.5m
(d) Velocity at any time t = v -9.8t
So, at t= 4sec, velocity = 49 – 9.8(4) =9.8m/s
at t= 9sec, velocity = 49 – 9.8(9) = -39.2m/s
(e) Average velocity = 
= -24.5m
(g) the stone is thrown vertically upwards, so no horizontal distance covered.
40 + y = 52 is the answer and the answer to y is 12
Answer:
B & D
Step-by-step explanation:
both B and D are non linear because they're not lines
Y=3x
D. (-10, -30)
Replacing in the equation;
x=-10
y=3(-10)
y=-30
Answer:
14 socks.
Step-by-step explanation:
30 socks in total. I think there is a 60% chance you will pull out a black sock??? But that doesn't matter. What if you were really unlucky and you pulled out all the navy socks? Then the answer would be 14 socks. To be CERTAIN, you want to pull out at least 14 socks. 12 socks for the navy. and 2 black socks.
