Answer:
the rock will sink. this is because it is more dense than water
Answer:
Acceleration of the bullet will be 1778835.6
Explanation:
We have given length of the barrel refile s= 0.855 m
When the bullet leaves the muzzle its velocity is 553 m/sec
So final velocity v = 553 m/sec
Initial velocity will be 0 that is u = 0 m/sec
According to third equation of motion 


Answer:

Explanation:
The equation of the position is:

Where:
v(i) is the initial velocity
The initial position y(i) will be zero and the final position y = 3.60 m.
So, we just need to solve this equation for v(i).



Therefore, the initial velocity is 10.10 m/s upwards.
I hope it helps you!
Answer:
1) Atmosphere
Explanation: because if you think about it the only real explaination is atmosphere.