The answer to this question is dropping it on a hard surface.
A) The vertical component of velocity v is taking the rock to a height
Vertical component =

The time taken to reach maximum height =

So total time of rocks flight =

Range of rock is due to the horizontal component of velocity =

Range =

=

Maximum height =

=

Since range = maximum height
We have



So when angle of projection is

range is equal to maximum height reached.
b) We have range =

=

Maximum of range is reached when

Maximum range =

c) For range to be equal to maximum height only condition is

, it does not depend upon acceleration due to gravity and velocity. That angle is a constant.
The net force acting on the piano is 500N
<h3>
When is two vectors Parallel ?</h3>
There will be parallel vectors when two vectors are moving in the same direction or opposite direction.
Given that a piano is hanging by a rope. Beside it are two vectors. The vector pointing upward is longer and labeled
= 6,000 N. The second vector is downward and labeled
= 5,500 N which will be negative because it will be acting downward.
Let the net force be
. Then,
=
+
= 6000 - 5500
= 500 N
Therefore, the net force acting on the piano is 500N
Learn more about Net Force here: brainly.com/question/11556949
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M = 150 kg.
Final velocity, v = 14 m/s
Initial Velocity, u = 6 m/s
Impulse = m(v - u)
= 150*(14 - 6)
= 150*8 = 1200 kgm/s or 1200 Ns