Question

A car accelerates uniformly from 18 km hr^-1 to 36 km hr^-1 in 5 seconds. Find

A) Acceleration

B) Distance travelled

Answer 1

Acceleration = Change in Velocity/Time

Change in Velocity = 36-18
= 18 km/h
= 18*1000/3600 m/s
= 5 m/s
Time= 5 Seconds

Acceleration = 5/5= 1 m/s^2

Equation of motion,s=ut+(1/2)at^2
u=18 km/h=5 m/s
t=5 s
a=1 m/s^2

s= (5*5)+(1/2*1*5^2)
s=25+12.5
i.e.,
s=37.5 m