A student states that the velocity of a train is 95 kilometers/hour. What is wrong with that statement?
The units should be in kilometers/second/second
Velocity must include a speed and direction
Velocity is a measure of the change in speed over time.
Velocity is the distance an object travels in seconds, not hours.
I'm not sure on this question. I think it either B or C. Please correct me if I'm wrong.
the speed is 95
the velocity also has to specify direction
Remember, for velocity you need speedometer AND compass.
ACCELERATION is rate of Change of Velocity
b
Thank you! I wasn't quite sure on this question. Also that was my last question. Thanks aging for checking my questions!
By the way km/h is a perfectly good way to specify speed. However once you get into calculating accelerations and stuff you will need to convert that to meters/second
You are welcome, good luck. Remember that speedometer and compass.
You are correct that option B and C could be valid reasons for what is wrong with the student's statement about the velocity of a train being 95 kilometers/hour. Let's break down each of these options to determine the correct answer:
Option B: Velocity must include a speed and direction.
This is a valid point because velocity is a vector quantity, meaning it has both magnitude (speed) and direction. So, if the student only states the speed (95 kilometers/hour) without mentioning the direction, it would be incorrect to call it velocity.
Option C: Velocity is a measure of the change in speed over time.
This is also a valid point because velocity represents both the speed and the change in position of an object over time. It considers how the object's position is changing in a specific direction. Therefore, if the student only states the speed without any reference to the change in position or direction, it would be an incomplete description of velocity.
However, option D: Velocity is the distance an object travels in seconds, not hours, is the most accurate answer to what is wrong with the student's statement. Velocity is typically expressed in units of distance over time, such as kilometers per hour or meters per second. The statement should have mentioned the distance covered by the train in one hour, rather than strictly referring to the velocity in terms of hours.
So, in summary, the correct answer is D: Velocity is the distance an object travels in seconds, not hours.