Answer:
A. SR
Explanation:
SR is strongtium and is an electronegative element:))
hope this helps:))
<span>Which element listed below is considered an alkaline earth metal?
</span>B) Magnesium
Answer: The velocity of the first ball is 0.875 m/s if the second ball travels at 1.5 m/s after collision.
Explanation:
Given:
= 0.2 kg,
= 0.15 kg
= 2 m/s,
= 0 m/s,
= ?,
= 1.5 m/s
Formula used is as follows.

where,
v = velocity before collision
v' = velocity after collision
Substitute the values into above formula as follows.

Thus, we can conclude that the velocity of the first ball is 0.875 m/s if the second ball travels at 1.5 m/s after collision.
Answer:
The volume will be 6, 67 L
Explanation:
We use the gas formula, which results from the combination of the Boyle, Charles and Gay-Lussac laws. According to which at a constant mass, temperature, pressure and volume vary, keeping constant PV / T:
P1xV1/T1 = P2 x V2/T2
V2= ((P1xV1/T1)xT2)/P2
V2=((1,5 atm x5 L/300K)x400K)/1,5 atm
V2=6, 67 L
Hydrosphere because it is water and water is where the dolphins swim.