Question

Vă rog să mă ajutați dau coroniță ​

Answer 1

1.  1080km/h=1080*1000m/3600s=300m/s

2. a) 36km/h=36*1000m/3600s=10m/s

   b) 10m/s=36km/h

3. d=200m

    t=30s

vm=?

vm=d/t=200m/30s=6,66m/s

4. a=60km

   ora in punctul a=7.30

   b=150km

   ora in punctul b=8.30

a) distanta parcursa=?

b)t=?

c)vm=?

   

a) distanta parcursa=b-a=150km-60km=90km

b)t=8.30-7.30=1 ora

c) vm=d/t=90km/1h=90km/h

Answer 2

$1.v_m=1080 km/h=1080*\frac{1000}{3600} m/s= \frac{1080}{3,6} m/s=300 m/s->b)\\\\2.a) 36 km/h=36*\frac{1000}{3600}m/s=\frac{36}{3,6} m/s =10 m/s=>36 km/h=10 m/s\\b)10 m/s=10*\frac{\frac{1}{1000} }{\frac{1}{3600} } km/h=10*\frac{3600}{1000} km/h=10*3,6 km/h=36 km/h=>10 m/s=36 km/h\\ \\3.d=v_m*t=>v_m=\frac{d}{t}= \frac{200}{30}= 6,66 m/s=6,6*3,6 km/h=24 km/h=>v_m=24 km/h$

$4.a) d=b_{150}-b_{60}=150-60=90 km=>d=90 km\\b)t=8:30-7:30=1 h=>t=1 h\\c)d=v_m*t=>v_m=\frac{d}{t}= \frac{90}{1}=90 km/h=>v_m=90 km/h$