Question

a cars velocity decreases uniformly 20 m/s to 6m/s while covering 70m distance in a straight line. Find its acceleration and time taken to the travel distance

Answer 1

Given:

$v_i=20\:\rm m/s$

$v_f=6\:\rm m/s$

$d=70\:\rm m$

$$d=\frac{v_f^2-v_i^2}{2a}$$

$$a=\frac{v_f^2-v_i^2}{2d}=\frac{6^2-20^2}{2*70}=-2.6\:\rm m/s^2$$