Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

A train is moving towards east with a velocity of 72kmph.its velocity is changed to 90 kmph towards west.find the change in velocity of the train and

explain your answer.
options: a) 20m/s due E b) 40m/s due W c) 20m/s due W d) 45m/s due W?


Initial velocity(u) = 72kmph = 20m/s towards east
final velocity(v) = 90kmph = 25m/s towards west
since velocity is a vector quantity, change in direction plays an important role
.`. v = 25m/s due west and u= -(20m/s) due west
[`.` change in direction changes the sign]
change in velocity = v - u
= 25 - [-(20)]
= 25 + 20
= 45m/s due west
.`. answer is option (d).....
1 5 1
plzz rate my answer the best if it helped you....
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts