Question

A girl running a race accelerates at 2.5 ms-2 for the first 4s of the race. How far does she travel in this time?

Answer 1

Answer:

Ans.  20

Explanation:

Using second equation of motion;

s = ut + 1/2at^2

s = 0 * 4 + 1 / 2 *  2.5  * (4 )^ 2     { 0 multiplied to any no. is 0}

s   =    1 / 2 * 2.5 * 16

s     =  2.5  *  8     ,     s = 20

Distance is 20.