Question

An object starting from rest increases its velocity to 48m/s in 4 sec. What is it's acceleration ?????

Answer 1

Hi Dear !
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Here, Initial Velocity (u) = 0   m/s
          Final Velocity (v)  = 48 m/s
          time  taken     (t)   = 4   seconds 
          acceleration   (a)  = ?
Using v  = u + at 
           48= 0 + 4a
          48 = 4a 
            a = 48/4 
            a = 12 m s^-2

Answer 2

Hello Friend!
Here, Initial Velocity (u) = 0   m/s(object starts from rest)
          Final Velocity (v)  = 48 m/s
          time  taken     (t)   = 4   seconds 
          acceleration   (a)  = not given
so to find the acceleration, we use the formula given below:
           v  = u + at 
           48= 0 + 4a
          48 = 4a 
            a = 48/4 
            a = 12 m s^-2
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