Question

Pls answer this I am poor in physics. This is class 9 lesson - motion pls answer I have to submit to my teacher

Answer 1

16) average speed= total distance/total time taken

= 32/6=5.33334

Answer 2

Answer:

14. S1 = 120 km ; V1 = 40km/h

T1 =120/40 = 3hr

S2 = 120 km

V2 = 30 km/h

T2 = 120/30 = 4hr

Total time taken = 3+ 4 = 7 hr

Total distance covered =120 + 120 = 240km

Average speed = total distance/total time

                           = 240/7 = 34.28km/hr

                                       

15. Distance covered in half an hour at 30km/hr = s×t = 30×1/2=15km.  Distance coveted in 1hr at 25km/hr= s×t= 25×1 =25km.                                     Total time taken= 3hrs and 30 mins=7/2 hrs.                                                                                                      Therefore, average speed=total distance covered/total time taken = 120×2/7 = 34.28km/hr

16. Total distance = 16 + 16 = 32m

        total time = 4+2s

Average speed = 32/6 = 5.33 m/s