1.false
2.true
3.true
4.true
5.false/not entirely sure
6.true
Answer:
Explanation:
Let the ball is thrown upwards with speed u and reaches upto height h.
Use III equation of motion

here, final velocity v = 0
So, 
Now as the ball reaches the maximum height, it starts falling freely. Let it strkes with the ground with velocity v'.

here, u = 0
So, 
It means the velocity is same as the velocity of projection.
Answer:
A concave lens is exactly the opposite with the outer surfaces curving inward, so it makes parallel light rays curve outward or diverge. That's why concave lenses are sometimes called diverging lenses.
A person should power walk 30-45 min a day