Answer:
Speed of car is 20.83 m/s
Speed of car is 75 km/h
Explanation:
Distance the car travels is 150 km
SI unit of distance is meters
[tex]1000\ m=1\ km\\\Rightarrow 150\ km=150\times 1000\\\Rightarrow 150\ km=150000m[/tex]
Time the car travels for is 7200 seconds which is SI units.
[tex]\text{Speed}=\frac{\text{Distance}}{\text{Time}}\\\Rightarrow \text{Speed}=\frac{150000}{7200}\\\Rightarrow \text{Speed}=20.83\ m/s[/tex]
Speed of car is 20.83 m/s
Let us find the speed in km/h
[tex]1\ h=60\ s\times 60\ m\\\Rightarrow 1\ s=\frac{1}{3600}\ h\\\Rightarrow 7200\ s=\frac{7200}{3600}\\\Rightarrow 7200\ s=2\ hours[/tex]
[tex]\text{Speed}=\frac{150}{2}\\\Rightarrow \text{Speed}=75\ km/h[/tex]
Speed of car is 75 km/h
Speed of the car: 20,833 m/s (or 21 m/s, two significant figures)
Regular straight motion is the motion of objects on a straight track that has a fixed speed
Formula used
[tex]\large {\boxed {\bold {S = v \times \: t}}}[/tex]
S = distance = m
v = speed = m / s
t = time = seconds
Straight motion changes regularly are the straight motion of objects that have a fixed acceleration
Formula used
[tex]\large {\boxed {\bold {St = vo.t + \frac {1} {2} at ^ 2}}}[/tex]
V = vo + at
Vt² = vo² + 2as
St = distance on t
vo = initial speed
vt = speed on t
a = acceleration
Each country usually has its own unit system. For example in the UK with inches and feet, Indonesia with "hasta", etc.
With the existence of these various units, we also need a variety of measuring devices in accordance with the specified units, and also conversion is needed from one unit to another. Therefore it is now agreed that there is a unit that is used as a standard that is an international system unit abbreviated as SI
There are 7 standard SI units used, namely:
The velocity itself is a quantity derived from the magnitude of length and time in SI units, m/s
A car traveling with constant speed travels 150 km in 7200 s
Here we know the distance traveled by the car = 150 km. We convert to SI units, namely m, to:
150 km = 150,000 m
while the time = 7200 s, it's already SI
Car speed is a straight-line motion because the speed is constant so the speed of the car:
V = S : t
V = 150,000 m : 7200 s
v = 20,833 m/s round up to two significant figures become 21 m/s
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Keywords: car, distance, speed, time
