17. At what speed must an object be launched vertically upward for the object to reach a maximum height of 16 meters above its starting position.
(Do not include units, do not include a sign, use 3 sig figs) *

Explanation:

When starting at a height of 0, and initial velocity v, the equation of projectile motion is

y = -4.9x^2 + v*x

Where x is the time in seconds and y is the height at time x.

The vertex (h,k) of this parabola is the highest point. In general the vertex has its x coordinate at h = -b/(2a), so,

h = -b/(2a)

h = -v/(2*(-4.9))

h = v/(9.8)

Plug this into the first equation shown above. Also, plug in y = 16. Solve for v.

So we get the following.

y = -4.9x^2 + v*x

16 = -4.9(v/9.8)^2 + v*(v/9.8)

16 = (-5/98)v^2 + (5/49)v^2

16 = (-5/98)v^2 + (10/98)v^2

16 = (-5/98+10/98)v^2

16 = (5/98)v^2

(5/98)v^2 = 16

v^2 = 16*(98/5)

v^2 = 313.6

v = sqrt(313.6)

v = 17.708754896943

v = 17.7

The starting velocity must be roughly 17.7 meters per second.

the answer is c i did the same question so i know that's right!

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.