Question

Dane:

E mechaniczna= 0,8 KJ

v= 72 km/h

h= 20m

Oblicz: masę (m)

Answer 1

E mech = 0,8 KJ= 0,8*1000 =800 J

v-72 km/h=20m/s

g=9,81

 

E mech= E pot+ E kin

Emech= m*g*h+ 

E mech= m*

m= 

m=800/(9,81*20)+/2

m=800/196,2+200

m=800/396,2

m=2,02kg