Recent content by bryansonex

  1. B

    Trigonometry differentiation problem

    Homework Statement Differentiate the following cos^2 x The Attempt at a Solution \frac{d(cos^2 x)}{dx} = 2 (-sin^{2-1} x).\frac{dx}{dx} = 2 (-sin x).1 = -2 sin x But the answer given is- -2 cos x sin x Can you please tell me what's wrong !
  2. B

    Average acceleration of a falling ball on contact with floor

    ohh...thanks nasu
  3. B

    Average acceleration of a falling ball on contact with floor

    Homework Statement A ball falls on the surface from 10m height and rebounds to 2.5m.If duration of contact with floor is 0.01 sec,then average acceleration during contact is- g = 10m/s^2 Homework Equations \alpha = \frac{v_2 + v_1}{t} The Attempt at a Solution Now here v_{1}...