Answer: - 30 miles / h^2
Explanation:
This problem requieres that you assume uniformly accelarated motion.
1) Data:
Vo = 60 miles / h
Vf = 30 miles / h
t = 12 min
a = ?
2) Formula:
Vf = Vo + at
3) Clear t:
a = [Vf - Vo] / t
4) convert t = 12 min to hours
t = 12 min * 1 h / 60 min = 0.2 h
5) Substitute the data into the formula
a = [30 miles/h - 60 miles/h]/0.2 h = - 30 miles / h^2
The negative sign means that the car decelerated.
Answer: - 30 miles / h^2
Answer:
Increase
Explanation:
If an object is falling for a greater distance, it will gain momentum and speed up.
Several kinds of energy do:
-- More mass at the same height has more potential energy.
-- More mass at the same speed has more kinetic energy.
-- More mass of cooked spinach has more food energy.
-- More mass of the same substance at the same temperature
has more heat energy.
Taking the vertical component of the displacement
1.1 - 0.2 = 0.9 mile
The horizontal component of the displacement
-0.3 mile
The magnitude of the displacement is
√[ (0.9)² + (-0.3) ] = 0.95 mile
The direction is
θ = tan-1 (-0.3/0.9)
θ = 161.57 degrees.