Question 1197727




the acceleration of the body is given by: 

{{{a=(v-u)/t}}}

 where {{{t}}} is the time taken to change the {{{initial}}} velocity {{{u}}} to final velocity {{{v}}}.

given:
{{{u=25( km/h)}}}
 {{{v=55( km/h)}}}
{{{t=30s}}}

The initial velocity in {{{m/s}}} : 

{{{u=25*(1000/3600)(m/s)=(125/18)(m/s)}}}

The final velocity in {{{m/s}}}: 

{{{v=55*(1000/3600)(m/s)=(275/18)(m/s)}}}

 
Plugging in all given values, we have

{{{a=((275/18)(m/s)-(125/18)(m/s))/30s}}}

{{{a=((25m/3s))/30s}}}

{{{a=0.278( m/s^2)}}}