When you drop a penny off the roof of a building, it takes 5 seconds to reach the ground. How high is the roof?

49meters

Explanation:

Remember that gravity(acceleration) is 9.8m/s.

9.8 m/s = It takes 1 second to fall 9.8 meters.

New question- How many meters will the penny fall in 5 seconds, if it takes 1 second to fall 9.8 meters.

All you have to do is multiply the total number of seconds (5) it takes to fall, and the acceleration/gravity (9.8m/s). You will get 49m.

Remember, that when an object is falling, the acceleration will be the gravity which is 9.8m/s.

:)

Mark me brainliest please :)

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂