Question

A particle is moving eastwards with a velocity of 5m/s. In 10 sec the velocity to 5m/s northward. The average acceleration in this time is -----
1) 1/√2 m/s² towards north east
2) 1/2 m/s² north
3) zero
4) 1/√2 m/s² towards north west

explane in detail

Answer 1

Vi =5i

Vf=5j

Avg acceleration =|(Vf -Vi)|/10

                        =|5j-5i)|10

                        =1/√2 m/s2

so the option 1 is the correct answer

Answer 2

Hey friend ur answer...

Average acceleration = final velocity - initial velocity / time taken
a=fv-iv/t
so,
a= 5-5/10
= 0/10
=0

Therefore, the answer is zero .