Question

Questions
1. If you walk for 1.5 hours and travel 7.5 km, what is your average speed

2.A bird flies at a speed of 15 m/s for 10 s, 20 m/s for 10 s, and 25 m/s for 5 s. What is the birds average speed?

Answer 1

1. v=d/t=7.5/1.5=5 km/h

2. v=d/t=(v1*t1+v2*t2+v3*t3)/(v1+v2+v3)=(15*10+20*10+25*5)/(10+10+5)=
   =(150+200+125)/25=475/25=19 m/s