Question

5.
A car is moving towards East with a velocity of 20 ms. Its velocity after 10 s is 20 ms due West. The
change in its velocity in this duration of 10 s.
a) 20 ms due East
b) 40 ms-' due East
c) -20 ms due East
d) - 40 ms due East​

Answer 1

Answer:

-40 ms due east

Explanation:

first velocity of a car is 20 ms due east means it is positive.after 10 seconds it's velocity is 20 ms due west means it is negative.-20ms . so formula for this is v-u ( v is final velocity and u is intial velocity)so -20-20 here -20 is velocity due west so it is negative.so -20-20) is -40 . so answer is

40 ms due west as -40 indicates that velocity due west.but here the option is not there.so east is opposite to west so the option is -40 ms due east . because here - indicates that it is opposite

Answer 2

Answer:

b) 40ms due east

Explanation:

40m per sec 20+20=40