Answer:
5488 Joules
Explanation:
Use the formula for the potential energy:

Answer:
the relative speed should be 40mph
Explanation:
Answer:
inelastic, since the girl moves in the same direction as the thrown ball
Explanation:
yess this ok
UwU
Answer:

Explanation:
Here we can use energy conservation
As per energy conservation conditions we know that work done by external source is converted into kinetic energy of the disc
Now we have

now we know that work done is product of force and displacement
so here we have


now for moment of inertia of the disc we will have



now from above equation we will have

