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Hey there,
1.) u =20 m/s,v=0,s=.05 m
Using eqn, (v^2-u^2)/2s=a
=>a=-400/.1 m/s^2= -4000m /s.
2.) a=36 km/h^2
,v=18 km/h. ,u=12 km/h
S=[(18)^2-(12)^2]/(2×36)=2.5km
4.) s=20km ,v1=40km/h ,v2=60km/h
t1=20/40hr=30min
t2=20/60hr=20min
T=t1+t2=30+20=50min=5/6 hr.
S=2s=40km
V=S/T=40/(5/6) km/h=48 km/h
5.)v1=75/10 km /h
S1=75/10×2/60 =1/4 km,t2=56min,
S2=1/4 km,
Total time=56+2+2=60min =1 h
Total distance=1/4+1/4=1/2km,
AVG. Speed=(1/2) km/hr .
Hope it will help
1.) u =20 m/s,v=0,s=.05 m
Using eqn, (v^2-u^2)/2s=a
=>a=-400/.1 m/s^2= -4000m /s.
2.) a=36 km/h^2
,v=18 km/h. ,u=12 km/h
S=[(18)^2-(12)^2]/(2×36)=2.5km
4.) s=20km ,v1=40km/h ,v2=60km/h
t1=20/40hr=30min
t2=20/60hr=20min
T=t1+t2=30+20=50min=5/6 hr.
S=2s=40km
V=S/T=40/(5/6) km/h=48 km/h
5.)v1=75/10 km /h
S1=75/10×2/60 =1/4 km,t2=56min,
S2=1/4 km,
Total time=56+2+2=60min =1 h
Total distance=1/4+1/4=1/2km,
AVG. Speed=(1/2) km/hr .
Hope it will help
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