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.
Answer:
Waves carry energy from one place to another. Because waves carry energy, some waves are used for communication, eg radio and television waves and mobile telephone signals. There are many types of waves including sound waves, water waves and all the parts of the electromagnetic spectrum.
Explanation:
Answer:F(of gravity) = MA
F(normal force) = MA * cos(angle)
F = 72 * 9.81 * cos28
Don't have a calculator, so can't really do all the math right there. So just plug that in
Explanation:
i dont really know
Answer:
a. burning of fossil fuel
Explanation:
Greenhouse effect is the trapping of the sun infrared rays in the outermost layer of the earths atmosphere due to the accumulation of some harmful gasses. This gases depletes the ozone layer
The major contributor of greenhouse gases is the burning of fossil fuels. Carbon dioxides are released into the atmosphere and leads to global warming and climatic changes per time