Answer:
The time it takes light to cover 1.5 km was too short to be measured by Galileo's instruments.
Explanation:
The speed of light is
, which means the time it takes to cover a distance of 1.5 km (or 1,500m) will be


which is
of a second! This time delay could in no way be measured by Galileo considering the fact that he was using his heartbeat to measure time!
Answer:

Explanation:
Given:
mass, m = 87.5kg
Velocity, V = 0.900c
now,
the relativistic kinetic energy id given as:
...........(1)
where,
= relativistic factor, given as; 
Now, the classical kinetic energy is given as:
..........(2)
Dividing the equation (1) by (2) we get

or

substituting the values in the equation we get,

or

Answer:
8.2 m/s upward
Explanation:
The motion of the ball is a free fall motion, so we can use the suvat equation:

where:
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time
Choosing upward as positive direction:

(acceleration of gravity)
t = 1.5 s
Solving for u, we find the initial velocity:

And the direction is upward.
Im gunna say a sandbar so answer is B.