If we tossed up a coin with some velocity then its acceleration in the air is due to gravity which we can take as a = - 9.8 m/s^2
Also it is given that coin returns to initial position after 4 s
So after 4 s its displacement will become ZERO
now in this process we can say that in whole motion of the coin the net displacement of coin is zero and its acceleration is due to gravity remains constant.
We can use kinematics here



so approximate speed of the coin must be nearly 20 m/s
Answer: I think it is true.
Explanation: Oxidation occurs when electrons are lost, while reduction occurs when electrons are gained. The two processes are linked, whenever one substance is oxidized another has to be reduced. The sodium ions (Na+) and chloride ions (Cl-) combine to form solid sodium chloride, which is an ionic compound.
The charge going to the clothes iron needs to be grounded so the iron does not make any shock
The correct answer to the question is D.Biosphere
Every planet has it's own gravity.Hence, they have their own atmosphere.The concentration of particles and gases may vary from planet to planet depending on their force of gravity.
Every planet contains the lithosphere,the hard and rigid outer layer which contains the crust and mantle.
Earth is the only habitable planet which supports biosphere.Its atmosphere contains 20% of oxygen along with nitrogen which are responsible for sustaining various types of flora and fauna as well as evolution of new species.
Distance = speed / time
<span>speed = distance / time </span>
<span>so, </span>
<span>speed = 50 m / 10 sec </span>
<span>speed = 5 meters per sec</span><span />