Answer:
0.4 s
Explanation:
The time that the ball is in the air can be found with the next formula:
where 
is the initial velocity of the ball, in this case:
β is the angle: β = 29.0°
And g is the acceleration of gravity: 
Replacing all the values to find t, we have:
Thus, the ball is 0.4s in the air.
They are called mechanical waves
Answer:
the answer is B
Melting point, temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.
Answer: SI unit of pressure
Explanation: The pascal (pronounced pass-KAL and abbreviated Pa) is the unit of pressure or stress in the International System of Units (SI). Reduced to base units in SI, one pascal is one kilogram per meter per second squared; that is, 1 Pa = 1 kg · m-1 · s-2.
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