The speed of a car was 50 km//hr for the first 900s, then 40 km/hr for the 50 km and then the car decelerated uniformly at 10 km//hr^(2) till it came to rest. The average speed of the car was :

The speed of a car was 50 km//hr for the first 900s, then 40 km/hr for

1.	The speed of a car was 50 km//hr for the first 900s, then 40 km/hr for the 50 km and then the car decelerated uniformly at 10 km//hr^(2) till it came to rest. The average speed of the car was :
Answer» 50 km/hr 7.2 m/s 30 km/hr 9.0 m/s Solution :AV. Speed `= ("Total distance")/("Total time")` `= ((v_(1)t_(1) + v_(2) t_(2) + (v_(2)^(2))/(2a_(2)))/(t_(1) + t_(2) + (v_(2))/(a_(2))))`