Answer:
a. a = 5 m/s^2
b. distance traveled = 112.5 m
Step-by-step explanation:
Acceleration is the rate of variation of the velocity of an object when it moves. If the object in question maintains its speed constantly, then it is not accelerating, something it will do when its speed changes. Acceleration is measured in meters per second squared, and it is based on the time it takes to move from one speed to another, or a force that is applied to the object.
In order to calculate it, it is essential that you know the acceleration formula (a = Δv / Δt). In it, "a" is the acceleration, "Δv" is the variation of the velocity and "Δt" is the time in that variation.
Calculation
a = Δv / Δt
a = (45 m/s - 30 m/s) / (3 s -0 s)
a = 5 m/s^2
To calculate the distance we need the average speed that he obtained in those 3 seconds
average speed: (45 m/s + 30 m/s) / 2 = 37.5 m/s
distance traveled = average speed * time
distance traveled = 37.5 m/s * 3 s
distance traveled = 112.5 m