Initial data: h (height from which the body freely fell) = 45 m; V0 (initial velocity of the body) = 0 m / s.
Reference data: g (acceleration due to gravity) ≈ 10 m / s2.
1) The final speed of the body (the law of conservation of energy): Ek = Ep = 0.5 * m * V2 = m * g * h and V = √ (2g * h) = √ (2 * 10 * 45) = √900 = 30 m / s.
2) The duration of the fall of the body: V = g * t and t = V / g = 30/10 = 3 s.
Answer: The time for the body to fall is 3 s; the final speed of the body is 30 m / s.
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