Question

1.
Ec=1800J
m=1 kg
Afla v=?
2.
Ec=4 kg
v=10m/s
Află m=?
Dau coroana plssss help meee​

Answer 1

Răspuns:

a)

$ec = \frac{m {v}^{2} }{2}$

Ec = 1800J

$v = \sqrt{ \frac{ec}{ \frac{1}{2}m } }$

$v = \sqrt{ \frac{1800j}{ \frac{1kg}{2} } }$

$v = \sqrt{3600} = 60 \frac{m}{s}$

b) 4 kJ = 4000 J

m = 2×Ec/v^2 = 8000 J/ 100 m/s = 80 kg