Answer:
u = 88.54 m/s
Explanation:
Given that,
A discus thrower achieves a high throw of 100 m.
Angle of projection is 30°
We need to find the initial speed of the discuss. It is a cse of projectile motion. The maximum height reached by the discus is given by :

u is the initial speed of the discus
So,

So, the initial speed of the discus is 88.54 m/s.
Explanation:
Below is an attachment containing the solution.
Biome is an open system because energy and matter are constantly being transferred in and out.
i hope this helped you..
:)
<span>Answer:
Correct answer is
just add the two kinetic energies;
E = (1/2)mv^2 + (1/2)mv^2</span>