Question

please solve the following ticked questions

Answer 1

13. d=3 km
t=0.5 hr
velocity = 6km/hr
=5/3 m/s= 0.1 km/min
17. avg speed = total dist/total time
=48 m/s

Answer 2

13)
 t=30 min=30*60sec=1800 sec
 d=3 km=3000m
 v in m/s=d/t
             =3000/1800
             =1.67m/s
v in km/h=(3000/1800)*(18/5)
              =6 km/hr
v in km/min=?
                  =6/60 km/min
                  =0.1 km/min

17)
v₁=40 m/s
v₂=60 m/s
ṽ(Average velocity)=?
                              =v=d/t
                              =t=d/v
 let distance be 2d
 so, t₁=d/40 sec
       t₂=d/60 sec
       Average velocity=(D₁+D₂)/(t₁+t₂)
                                 =2d/(d/40+d/60)
      on solving we get avg. velocity as 48m/s











Hope this helps
Cheers,
Abhigyan