How much w work is done by a babysitter who uses 4500 w of power to lift a baby in 4s
1 answer:
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Answer:
b = 0.89
Explanation:
The given vector is,
A is a unit vector
We need to find the value of b.
For a unit vector, |A| = 1
So,
So, th value of b is 0.89.
The car is initially traveling north at 17.7 m/s, and after 12 s, its velocity is 14.1 m/s, still due north. This means that the direction of the car has not changed, so we can already say that the direction of the acceleration is north (if the magnitude of the acceleration is positive) or south (if the magnitude of the acceleration is negative).
To find the magnitude of the average acceleration, we must calculate the ratio between the change in velocity and the time taken:
Since the acceleration is negative, it means it is in the opposite direction to the motion of the car, therefore south. Therefore, the correct answer is
b) 0.30 m/s2, south