Answer:
a) 


b) 

c)

Explanation:
We have:
m: is the ball's mass = 1.5 kg
v₀: is the initial speed = 15 m/s
g: is the gravity acceleration = 9.81 m/s²
a) In the initial position we have:
h: is the height = 0
The potential energy is given by:

The kinetic energy is:

And the mechanical energies:

b) At 5 m above the initial position we have:
h = 5 m
The potential energy is:

Now, to find the kinetic energy we need to calculate the speed at 5 m:



And the mechanical energies:
c) At its maximum height:
: is the final speed = 0

Now, the potential, kinetic and mechanical energies are:

I hope it helps you!
Answer:
The combined speed of camper and canoe is 1.71 m/s.
Explanation:
Given that,
Mass of camper 1, m = 100 kg
Speed of camper 1, v = 3 m/s
The combined mass of another camper and canoe is, M = 175 kg
We need to find the combined speed of camper and canoe. According to the conservation of linear momentum, the momentum of first camper is equal to linear momentum of the canoe and the second camper.

So, the combined speed of camper and canoe is 1.71 m/s.
I know that 4. Is wave 2 and 5. Is wave 3.
Answer: True
Explanation:
Because plants have an increase in vigar to grow
Answer:
i = 61 degree
Explanation:
Given,

Now, by the snell's law

Now,
Sin i / sin r = n 2 / n 1
sin i / sin r (45 - 24.09) = 2.45 / 1
i = 60.97 degree