Answer:
1.05kg
Step-by-step explanation:
Soln
Kinetic energy = 475 J
Velocity = 30.0m/s
mass = ?
Recall,
Kinetic energy = 1/2 × mass × (velocity)²
K.E = 1/2 × m × v²
475 = 1/2 × m × (30)²
475 = 1/2 × m × 900
475 = m × 450
divide both sides by 450
475/450 = m
m = 475/450
m = 1.05kg