Work done against gravity in lifting a 5 kg mass through 2 m (g=10) is MCQ with Answer and Explanation

Explanation:
Galileo first proposed concept of inertia. Newton formalized.

Explanation:
Work done by a variable force is the definite integral of F dx. W = Integral(3x^2 + 2x) dx from 1 to 2. W = [x^3 + x^2] evaluated from 1 to 2. Upper limit: (2^3 + 2^2) = 8 + 4 = 12. Lower limit: (1^3 + 1^2) = 1 + 1 = 2. Work = 12 - 2 = 10 Joules.

Explanation:
Infrasound < 20 Hz, ultrasound > 20 kHz.