SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The best way to describe the rate of motion of an object that changes speed several times is to calculate the object’s ____
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Average speed
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Constant speed
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Variable speed
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Instantaneous speed
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Explanation:
Detailed explanation-1: -Acceleration is defined as the rate of change of motion of a body. In other words, the measure of the rate of change in its speed along with direction with respect to time is called acceleration.
Detailed explanation-2: -Time = Distance / speed = 1800/40 = 45 hours. Thus we can find the average speed as: Average Speed = (Total distance)/(Total Time) = (1800 + 1800)/(30 + 45) = 3600/75 = 48 km/hr.
Detailed explanation-3: -Acceleration: Acceleration is the rate at which an object changes its velocity. It is a vector quantity like velocity. Its unit is m/s.
Detailed explanation-4: -Average velocity is displacement divided by time interval of the displacement.
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