Which equations can be used to solve for acceleration? Check all that apply.t =
2 answers:
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Answer:
Time, t = 2 minutes
Explanation:
Given that,
Length of Duplain st. d = 300 m = 0.3 km
If keith is strolling east from Baron at an average velocity of, v = 3 km/hr
Sue is power-walking west from Burkey at an average velocity of, v' = 6 km/hr
To find,
How long will it take them to meet ?
Solution,
When both objects are travelling in opposite direction, then the total speed is given by :
V = v + v'
V = 3 km/hr + 6 km/hr
V = 9 km/hr
Let t is the time taken will it take them to meet. It can be calculated as :
t = 0.033 hour
or
t = 1.98 minutes
i.e. t = 2 minutes
So, they will take 2 minutes to meet. Hence, this is the required solution.
False: when reporting speed, only value and units are needed, not the direction
Explanation:
Let's start by reminding the difference between speed and velocity:
- Speed is a scalar quantity which tells "how fast" an object is moving, regardless of its direction of motion.
It can be calculated as: follows:
where :
d is the distance travelled
t is the time interval
Therefore, speed has no direction, so it is written only as a value followed by units: for example, 5 m/s.
- Velocity is a vector quantity given by:
where :
d is the displacement of the object (which is a vector connecting the initial position to the final position of motion)
t is the time interval
Since it is a vector, velocity has both magnitude and direction, therefore it also takes into account the direction of motion of the object. An example of velocity is 5 m/s east, where the direction is also specificied.
Learn more about speed and velocity:
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