# physics

posted by .

A golf ball is dropped from rest from a height of 8.20 m. It hits the pavement, then bounces back up, rising just 5.40 m before falling back down again. A boy then catches the ball when it is 1.40 m above the pavement. Ignoring air resistance, calculate the total amount of time that the ball is in the air, from drop to catch.

• physics -

h1=g•t1²/2=>
t1=2•h1/g= 2•8.2/9.8=1.8 s.

Since the time of ascening = time of descending,
t2=2•h2/g=1.1 s.

h3=5.4-1.4 =4 m
t3=2•h3/g=2•4/9.8=0.82 s.
t=1.8+1.1+0.82=3.72 s.

• physics -

1.5

• physics -

Elena is incorrect, in that you must take the square root of each thing.

## Similar Questions

1. ### calculus

A ball has bounce coefficient 0 < r < 1 if when it is dropped from height h, it bounces back to a height of rh. Suppose that such a ball is dropped from an initial height a and subsequently bounces infinitely may times. Find …
2. ### physics

a superball of mass .125 kg is dropped onto a concrete floor from a height of 1m it bounces back at a height of .9m. What is the net force acting on the ball before and after its released?
3. ### physics

A golf ball is dropped from rest from a height of 8.20 m. It hits the pavement, then bounces back up, rising just 5.40 m before falling back down again. A boy then catches the ball when it is 1.40 m above the pavement. Ignoring air …
4. ### physics

A golf ball is dropped from rest from a height of 9.60 m. It hits the pavement, then bounces back up, rising just 5.30 m before falling back down again. A boy then catches the ball when it is 1.11 m above the pavement. Ignoring air …
5. ### physics

A golf ball is dropped from rest from a height of 8.40 m. It hits the pavement, then bounces back up, rising just 5.30 m before falling back down again. A boy then catches the ball when it is 1.20 m above the pavement. Ignoring air …
6. ### physics

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air …
7. ### physics

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air …
8. ### physics

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air …
9. ### Physics

A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air …
10. ### Maths

A ball is dropped from height of 100 feet towards the ground. It hits the ground and bounces back 80% of the fall. This continues till the ball comes to rest. Find the vertical distance covered by the ball

More Similar Questions