Question

a body moves in a straight line and covers first half of the distance with speed 5m/s and second half in two equal halves with speed 4 m/s and 3 m/s respectively.the average velocity of the body is
1)4m/s
2)3m/s
3)2m/s
4)2.5m/s​

Answer 1

answer 1

explanation

v1=5m/s

v2=4+3/2=7/2

avg velocity when body covers half of the distance with v1 and half of distance with v2

then avg velocity is equal to 2v1v2/v1+v2

2into5into3+4/2/5+7/2=4.1

approx 4 m/s