Answer:
A
Explanation:
If the object is moving at a constant speed, the object isn't accelerating as the velocity doesn't change.
Athletes of any kind can use technology to monitor things like their BMI (body mass index) or weight or anything of the sort to target what they need to work on to improve their health.
On Earth, the period of a pendulum is given by:

where L is the length of the pendulum and

is the gravitational acceleration on Earth.
Similarly, the period of the same pendulum on Mars will be

where

is the gravitational acceleration on Mars.
Therefore, if we want to see how does the period of the pendulum on Mars change compared to the one on Earth, we can do the ratio between the two of them:

Therefore, the period of the pendulum on Mars will be 1.63 times the period on Earth.
Answer:
I'll just assume that the question is what's the velocity of the airplane before it takes off because you haven't included a question. Where u: velocity, a: acceleration, t: time

Three time the energy was needed than in case one.
What is energy?
In physics, energy is the quantifiable property that is transmitted to a body or a physical system and is visible in the form of heat and light. The law of conservation of energy states that energy can be converted in form but cannot be created or destroyed.
Case 1:
Vo = 0 m/s
V1 = 15 m/s
Case 2:
Vo = 15 m/s
V1 = 30 m/s
Change in KE = 1/2 × m × (V1^2 - Vo^2)
KE1 = 1/2 × 1000 × (15^2 - 0)
= 112.5 kJ
KE2 = 1/2 × 1000 × (30^2 - 15^2)
= 1/2 × 1000 × 675
= 337.5kJ
Case 1 has an increase of 112.5 kJ energy while Case 2 has an increase of 337.5kJ.
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