Answer:
150.15 J
Step-by-step explanation:
From the question given above, the following data were obtained:
Mass (m) = 5 kg
Height (h) = 3 m
Kinetic energy (KE) =?
Next, we shall determine the velocity of the toy before hitting the ground. This can be obtained as follow:
Initial velocity (u) = 0 m/s
Height (h) = 3 m
Acceleration due to gravity (g) = 9.8 m/s²
Final velocity (v) =?
v² = u² + 2gh
v² = 0² + (2 × 10 × 3)
v² = 0 + 60
v² = 60
Take the square root of both side
v = √60
v = 7.75 m/s
Thus, the velocity of the toy before hitting the ground is 7.75 m/s.
Finally, we shall determine the kinetic energy of the toy before hitting the ground. This can be obtained as follow:
Mass (m) = 5 kg
Velocity (v) = 7.75 m/s.
Kinetic energy (KE) =?
KE = ½mv²
KE = ½ × 5 × 7.75²
KE = 2.5 × 60.06
KE = 150.15 J
Thus, the kinetic energy of the toy before hitting the ground is 150.15 J