Question

You can enter units that are combinations of units with prefixes. however, you must maintain the same unit system given in the problem. for example, this question uses the si unit system. therefore an answer in u.s. customary units, such as miles per hour would not be accepted as correct. a car traveling with constant speed travels 150 km in 7200 s. what is the speed of the car?

Answer 1

Speed ​​of the car: 20,833 m/s (or 21 m/s, two significant figures)

Further explanation

Regular straight motion is the motion of objects on a straight track that has a fixed speed

Formula used

$\large {\boxed {\bold {S = v \times \: t}}}$

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

$\large {\boxed {\bold {St = vo.t + \frac {1} {2} at ^ 2}}}$

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:

• 1.meter (m) unit length,
• 2. kilograms (kg), units of mass
• 3. second (s), unit of time
• 4. ampere (A), unit of current
• 5. kelvin (K), unit of temperature
• 6. candela (cd), the unit of light intensity
• 7. mole, concentration unit

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

Learn more

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Keywords: car, distance, speed, time

Answer 2

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

$1000\ m=1\ km\\\Rightarrow 150\ km=150\times 1000\\\Rightarrow 150\ km=150000m$

Time the car travels for is 7200 seconds which is SI units.

$\text{Speed}=\frac{\text{Distance}}{\text{Time}}\\\Rightarrow \text{Speed}=\frac{150000}{7200}\\\Rightarrow \text{Speed}=20.83\ m/s$

Speed of car is 20.83 m/s

Let us find the speed in km/h

$1\ h=60\ s\times 60\ m\\\Rightarrow 1\ s=\frac{1}{3600}\ h\\\Rightarrow 7200\ s=\frac{7200}{3600}\\\Rightarrow 7200\ s=2\ hours$

$\text{Speed}=\frac{150}{2}\\\Rightarrow \text{Speed}=75\ km/h$

Speed of car is 75 km/h