Answer:
A pure substance has only one substance while a mixture has two or more substances
Explanation:
Answer: 12.6 s
We would use the equation of motion:
where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken.
It is given that the lead car has an initial velocity, . It decelerates with to stop (v=0). we need to calculate the time taken by the lead car to stop.
Forward and downward speed are referred to as acceleration and deceleration respectively.
<h3>
What is Acceleration?</h3>
This is the rate at which an object gains speed with respect to time with its unit being meter per second square(m/s²).
Objects in constant speed are said to have a uniform motion. The downward speed is known as deceleration which involves the object losing speed to return to a state of rest.
Read more about Acceleration here brainly.com/question/460763
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