Question

A car is initially traveling due north at $23m/s$. Find the velocity of the car after 4 s if its acceleration is $2m/s^2$ due north (in m/s) :

• A. $31$ due north
  
• B. $32$ due south
  
• C. $36$ due north
  
• D. $35$ north
  

Answer 1

The correct option is A $31$ due north

Initial speed of car $u=23m/s$
Time taken $t=4s$
Acceleration $a=2m/s^2$
Applying $Ist$ $eqn$ of motion,
$v=u+at$
$v=23+2\times 4$ (Since acceleration and initial speed both are in same direction)
$⟹$ $v=31m/s$ (due North)