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1. A) Distance covered = 800 m
B) Displacement = 0
2. Average speed = total distance /total time
= 30km+30km/(30/40)+(30/20) h
=60km/(3+6)/4 h
=60km/(9/4)
=240/9 km/h
=26 2/3 km/h
3. Speed=35km/h
=35*5/18
Time=12min
=12*60s
Distance travelled =35*5/18*12*60 m
=7000 m
=7 km
4. u=36km/h *5/18 =10m/s
v=54km/h *5/18 =15m/s
a = (v-u) /t = (15-10)/10 m/s^2 =0.5 m/s^2
B) Displacement = 0
2. Average speed = total distance /total time
= 30km+30km/(30/40)+(30/20) h
=60km/(3+6)/4 h
=60km/(9/4)
=240/9 km/h
=26 2/3 km/h
3. Speed=35km/h
=35*5/18
Time=12min
=12*60s
Distance travelled =35*5/18*12*60 m
=7000 m
=7 km
4. u=36km/h *5/18 =10m/s
v=54km/h *5/18 =15m/s
a = (v-u) /t = (15-10)/10 m/s^2 =0.5 m/s^2
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