Question

An object travels 27m in 5 s and then another 28m in 4 s . The average speed of the object is

12 km/h

6 km/h

5 km/h

28 km/h

​

Answer 1

Answer:

[ average speed = total distance travelled /total time taken ]

average speed = 27m + 28m / 5s + 4s

= 55m/9s

now , convert it into km/hr ,

55/9 * 18/5 = 22km/hr......

your answer is 22km/hr

Answer 2

Average speed=Total displacement/Total time
Vav.=27+28/5+4
=>55/9
=>6.1m/s
Or 6.1*5/18 km/h
=>5km/h
3rd option is correct