A particle moving in a straight line covers half the distance with speed of 12 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is________
A. 8.0 m/s
B. 12.0 m/s
C. 10.0 m/s
D. 9.8 m/s
Answer:A
A particle moving in a straight line covers half the distance with speed of 12 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is________
A. 8.0 m/s B. 12.0 m/s C. 10.0 m/s D. 9.8 m/s