Question

alina drives 20 miles from her home to the store at a speed of 30 miles per hour.if she makes the return trip home at a speed of 40 miles per hour, what is the total amount of time she spent driving​

Answer 1

Step-by-step explanation:

kinetic energy is minimum, potential energy is maximum.

In SHM, kinetic energy is maximum at mean position and zero at the extreme positions while potential energy is zero at mean position and maximum at the extreme positions.

Answer 2

70.2 mins or 1.17 hours

Step-by-step explanation:

time taken to drive to store

= 20/30 = 0.67 hours

time taken to come back

= 20/40 = 0.5 hours

total = 1.17 hours