Answer:
Explanation:
Since the universal SI unit for velocity is meters/second, let's convert ft/s to m/s:
We can use the following kinematics equation to solve this question:
What we know:
- The initial velocity,
, is 
- (physics concept) The final velocity must be equal in magnitude but opposite in direction to the initial velocity (
) - Acceleration,
, is acceleration due to gravity at about 
Solving for 
:
Your answer is the ball it's very simple a ball rolling down hill will be the one that makes the most sense.
Accuracy
Explanation:
Accuracy is a term that refers to the exactness of a measurement.
Accuracy is the nearness of measured value to the true value.
The difference between the measured value and the true value is the uncertainty in the measurement.
- The closer a measured value is to the true value, the more accurate the measurement is. The lesser the error accrued in the process.
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When an object is becomes warm its an example of exothermic reaction.
First, we must recall that distance is the total length traveled by an object in which the direction of the motion does not matter. Meanwhile, displacement is the distance of the object from its starting point which means the directions matters for displacement.
Now, speed is distance over time while velocity is displacement over time. Since we're talking about the same object's motion, the total time traveled is (120 + 90) = 210 seconds.
Now, the total distance traveled by the object is (400 + 250) = 650 m. Meanwhile the total displacement traveled by the object is 400 m, East + 250 m, West = 150 m, East.
Now, to find the speed and velocity, we just divide the values of distance and displacement, respectively, over time. Thus, we have
speed = 650 m / 210s ≈ 3.095 m/s
velocity = 150 m, East /210 s ≈ 0.714 m/s, East
Now, rounding the values up to 2 significant digits, we have
a) speed = 3.1 m/s
b) velocity = 0.71 m/s, East
