4.69 m/s
Explanation:
The formulae for calculating Kinetic Energy (K.E) is;
K.E = 0.5 * m * v² where
m – mass (kg)
v – velocity (m/s)
The initial K.E by the ice skater is, therefore;
= 0.5 * 50 * 5²
= 625 joules
The ice skate loses 75 joules so they are left with K.E of;
625 – 75
= 550 joules
Since their mass does not change, their velocity changes to;
550 = 0.5 * 50 * v²
22 = v²
v = 4.69
= 4.69 m/s
