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?

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

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

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

The distance of the elevator

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resultant velocity

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the average velocity

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Keywords: car, distance, speed, time

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s