Question

A car start from rest and acquire a velocity of 54 km / h in 2 s. Find acceleration

Answer 1

Here we've
=> u= 0 m/s , v=54 km/h , t=2 sec , a=?

Since 'v' is given in km/h we've to convert it into m/s by multiplying it with 5/18
=> 54 *(5/18) => 15 m/s

We can use the equation
=> v=u+at
=>15=0+a*2
=>a=15/2
=>a=7.5 m/s²

Answer 2

v = u +at
----------------------
u =0
v = 54km/hr
= 54 x 5/18
=270/18
=15 m/s

time =2 s

v = u + at

15 = 0 + a(2)

a = 15/2

=7.5 m/s²