A car is initially moving at 20 m/s east and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval?

a. northeast

b. northwest

c. west

d. north of west

d

Explanation:

Given

First car is moving  towards east with velocity 20 m/s

then it turns towards north then velocity is  

suppose car takes t sec to change its path so average acceleration is given by

So average  acceleration is towards North of west.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

pe = weightxheight = 2000x1000=2,000,000joules