(i)P is a compound. (ii) X and Y are compounds. (iii)X and Y are elements. (iv)P has a fixed composition.

Slope of velocity time graph gives acceleration. Because slope of the curve = v/t, where v/t = acceleration.

When a horse pushes the ground backwards (as action), then ground forces back the horse (as reaction) in forward direction. Due to this, the horse is able to pull a Tanga in forward direction.

If, m = 1 kg, F = 1 N, then, F = ma Or, 1 N = 1 kg x a Or, a = 1 N/ 1 kg = 1 kg – ms⁻²/ 1 kg = 1 ms⁻²

Given, u = 60 km/h = 60 x 5/18 m/s = 50/3 m/s, T = 1.6 s, V = 0 Average Acceleration: a = v – u/t = -50/ 3 x 1.6 = – 100/ 3 x 3.2 = – ...