Question

a driver starts his parked car and within 5 seconds reaches a speed of 60km/h as he travels east. what is his acceleration

Answer 1

$a = \tfrac{v}{t}$

$a = \tfrac{60km/hr}{5s}$

$a = \boxed{12 km/hr/s }$

Hope this helps :D

Answer 2

5 Sec -60Km
4 Sec -48Km
3 Sec -36Km    
2 Sec -24Km
1 Sec -12Km


12km/h per second