Arrow at the left side pointing towards right side represents the frictional force as it always acts opposite to motion

let's use first equation of motion to solve this ;
Velocity after 30 seconds = 170 m/s
Answer:
here's the pdf for it
IB QuestionbankExplanation:
Answer:
Mechanical waves need matter to transfer energy while electromagnetic waves do not. ... Waves change direction when they move from one material into another (matter) through the process of refraction. The wave will change direction when the speed of the wave changes.
Answer:
<u>Magnitude</u>
Explanation:
Each value in nature has a number part, called its magnitude and a dimension called its unit.
For example,
The length of an object is 10 cm. It means that 10 shows the magnitude of length and cm shows its unit.