Răspuns:
1. Ec= mxv²/2= 0,45 kg x v²/2
=> 1,764=0,45 x v²/2
=> v²= 1,764 x 2/0,45
=> v²=3,528/0,45
=> v²=7,84
=> v=2,8 m/s
=> d)
2. Ep= m x g x h
Ep= 0,055 kg x 10 x h
10,01=0,55 x h
h=10,01/0,55
h=18,2 m
=> c)
3. E = Ec + Ep
16,17 = 11,79 + Ep
16,17 - 11,79 = Ep
4,38=Ep
Ep = 4,38
=> d)
4. => a)
5. L = F x d
18,5 = 2,5 x d
d = 18,5/2,5
d = 7,4 m
=> e)
