Question

A car accelerates uniformly from 18km per hour to 36km per hour in 10 seconds . Calculate the acceleration in km/h^2

Answer 1

Answer:Acceleration = Change in Velocity/Time

Change in Velocity = 36-18 = 18 km/h=5 m/s

Time= 5 Seconds

Acceleration = 5/5= 1 m/s2

Equation of motion,s=ut+(1/2)at2

u=18 km/h=5 m/s

t=5 s

a=1 m/s2

s= (5*5)+(1/2*1*5*5)

s=25+12.5 i.e., s=37.5 m

Hope you are clear with my explanations

Answer 2

To change second to hour you need to divide by 60 because 1 minute equal to 60 seconds then divide again by 60 because you want your answer in km/h right? So you will get 360.