Number 3.hydrogen and oxygen atoms because covalent bonds have both hydrogen and oxygen in them
Q.1
Answer . Momentum = mass x velocity
Momentum/mass = velocity
5/0.8 = velocity
6.25 m/s = velocity
Q.2
Answer . F = ma => a = f/m => a = 7/3.2 => a = 2.1875m/s²
Just subtract the both of them.
1.) The rain will erode the concrete that's why sometimes you see marks in concrete surfaces.
2.) The streams, creeks, rivers, and etc, would overflow or flood and make new bodies of water but then when it dries up the water will dry up.
