how do you do this problem? and please explain?

Question

plate tectonics in india move 15 cm/year. formations occurred during the last 1.00 x 10 to the 7th power. then india's formation slowed to about 5 cm/year. what is the acceleration in cm/year squared during this time period?

Answer 1

Dear Truman,
Acceleration is the rate of change of velocity.
Given your Question this is just: Change of Velocity/Time
a = (v - u)/t


You have the original velocity u = 15 cm/yr
the final velocity v = 5 cm/yr
and the time t = 10 Myr

Substitute in gives the answer- which is negative.
I'll leave that for you to do.


This means a deceleration!