Question

A particle moving in a straight line covers half the distance with a speed of 3 m/s. the other half of the distance is covered in two equal time intervals with speed of 4.5 ./s and 7.5 ./s respectively. the average speed of the particle during the entire motion is (a) 4 m/s (b) 5 m/s (c) 5.5 m/s (d) 4.8 m/s​

Answer 1

Answer= 5m/s

3+4.5+7.5=15

time=3sec

s=d÷t

15÷3=5m/s