Object of mass 80kg is dropped from plane. Terminal velocity is 60m/s. what is velocity after 2 seconds.
the way i thought about it would be
V = Vi +at
so V = 0 + (9.8*1) for the first second
and V = 0 + (9.8 *2) for the second second
which would be 19.6 because the object has not yet reached terminal velocity, but 19.6 is not one of the correct answers to choose from

Question

Object of mass 80kg is dropped from plane. Terminal velocity is 60m/s. what is velocity after 2 seconds.
the way i thought about it would be
V = Vi +at
so V = 0 + (9.8*1) for the first second
and V = 0 + (9.8 *2) for the second second
which would be 19.6 because the object has not yet reached terminal velocity, but 19.6 is not one of the correct answers to choose from

amistre64 · Answer

what are the options?

amistre64 · Answer

velocity is a vector, so direction is important as well .... so a negative value may be technically  appropriate

anonymous · Answer

well i changed the numbers because i didnt want to straight copy the book i thought understanding how it was solved would be better. But in my book the mass is 60kg and Terminal velocity is 55m/s. options are 110m/s 16.5m/s 34m/s 20m/s

amistre64 · Answer

your thoughts were accurate with the information you provided

v = gt

anonymous · Answer

so i guess just round to 20m/s

amistre64 · Answer

yep

anonymous · Answer

alright it just seemed weird to me that one option was a decimal while the others were not. and since i got a decimal i just thought i was doing something wrong

amistre64 · Answer

:)  some times they assume g = 10 m/s^2