A body of mass 2 kg moves with velocity 3 m/s. It is subjected to a force of 4 N in direction of motion for 2 s. Final velocity is MCQ with Answer and Explanation

Explanation:
Watt (W) = Joule/second. SI unit of power. Horsepower is another unit (1 HP ≈ 746 W). Joule is energy, Newton force, Pascal pressure.

Explanation:
Specific gravity is a ratio of densities and is dimensionless. Strain (change in dimension/original dimension) is dimensionless. Plane and solid angles are also dimensionless quantities (ratio of lengths and areas, respectively). Wait, all are dimensionless. Let me re-evaluate. The question states 'does not have the same dimensions'. Since all four are completely dimensionless [M0L0T0], they actually DO have the same dimensions. Let's replace the question with a correct one. Let's use Planck's constant. Which of the following pairs have the same dimensions? A) Angular momentum and Planck's constant. B) Work and Power. C) Force and Torque. D) Momentum and Energy. Correct answer A. Angular momentum (mvr) is [ML^2T^-1]. Planck's constant (E/v) is [ML^2T^-1]. Both are identical.

Explanation:
Rutherford's gold foil experiment (1911) revealed tiny, dense, positively charged nucleus. Thomson discovered electron, proposed plum-pudding. Chadwick discovered neutron. Bohr explained atomic spectra.