Question

A man of mass m starts moving on a plank of mass m with constant velocity v with respect to plank. If the plank lies on a smooth horizontal surface, then velocity of plank with respect to ground is

Answer 1

Let x be the distance covered by planck then,

Mx = m(L-x)

Solving for x,

(M+m)x = mL

x = mL / (M+m) .

Speed of planck = > x/t =  > mL / (M+m)t .  

i think none of these

Answer 2

Answer:

Theory. Planck's constant (h), a physical constant was introduced by German physicist named Max Planck in 1900. The significance of Planck's constant is that 'quanta' (small packets of energy) can be determined by frequency of radiation and Planck's constant