Answer:
Speed of larger piece is 
Explanation:
We apply the principle of conservation of momentum.
The watermelon is initially at rest. The initial momentum = 0 kg m/s in all directions.
After the collision,
Vertical momentum = momentum of piece in y-direction + y-component of momentum of larger piece = 
Here,
is the y-component of velocity of larger piece.
This is equal to 0, since the initial momentum is 0.

Horizontal momentum = momentum of piece in x-direction + x-component of momentum of larger piece = 
Here,
is the x-component of velocity of larger piece.
This is also equal to 0, since the initial momentum is 0.

The velocity of the larger piece,
, is the resultant of
and
. Since they are mutually perpendicular,


Answer:
Density is determined by an object's mass and volume.
Explanation:
If two objects take up the same volume, but one has more mass, then it also has a higher density.
False. reaction time would be lapse of time between external stimuli and muscular movement
Answer:
KE = 10530 J or 10.53 KJ
Explanation:
The formula for kinetic energy is KE = 1/2 mv^2
Let's apply the formula:
KE = 1/2 mv^2
KE = 1/2 (65kg) (18m/s)^2
KE = 10530 J or 10.53 KJ