Question

A motor car is going due north at a speed of 50 km/ h.it makes 90degre .
The change in velocity of car is about

Answer 1

$\huge\underline\blue{\rm Solution:}$

Initial Velocity (u) = $\sf{50\hat{j}km/h}$

Final Velocity (v) = $\sf{-50\hat{i}km/h}$

Magnitude of Velocity :

∆V = $\sf{-50\hat{i}+50\hat{j}}$

∆V = $\sf{50\sqrt{2}}$

∆V = 50 × 1.4

∆V = 70 km/h

Hence ,

Change in Velocity of car is about

70km/h towards south-west