M:240 g h:80cm v:9 km/j ep:...? ek:...? em:...?

ep = m .g . h
240 gr x 10 m/s² x 80 cm
192.000 j
ek = 1/2 x m x v²
1/2 x 240 x 9
1/2 x 240 x (9)²
1/2 x 240 x 81
9720 j