This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
Step 1: Identify the quantities. The object falls from a height of 25\,m (above ground) onto the roof at 5\,m (above ground). Thus, distance fallen s=25-5=20\,m. Initial velocity u=0\,m\,s^-1 (freely falling from rest). Acceleration a=g=10\,m\,s^-2. Step 2: Use the kinematic equation. v^2=u^2+2as Step 3: Substitute the values. v^2=0^2+2×10\,m\,s^-2×20\,m v^2=400\,m^2\,s^-2 Step 4: Solve for v. v=sqrt(400)\,m\,s^-1 v=20\,m\,s^-1 20 \ m\,s^-1