## Essential University Physics: Volume 1 (4th Edition) Clone

a) We simplify the equation for final velocity in order to find the initial velocity: $v_0 = \sqrt{v_f^2 - 2a\Delta x}$ $v_0 = \sqrt{5^2 - 2(-6.3)(34)}=\fbox{21.3 meters per second}$ b) We find the change in time: $t = \frac{5-21.3}{-6.3}=\fbox{2.6 seconds}$