Question

answer this question ​

Answer 1

Answer:

30 m/s

Explanation:

Let the total journey distance be "d".

Now, for half journey, since velocity = distance/time

$20 = \frac{\frac{d}{2}}{t_{1}}\\\\20t_1 = \frac{d}{2}\\\\d=40t_1$

For average velocity to be 24 m/s,

$24 = \frac{d}{t_1+t_2}\\\\24 = \frac{40t_1}{t_1+t_2}\\\\24t_1+24t_2=40t_1\\\\24t_2=16t_1\\\\t_2 = \frac{2}{3}t_1$

Now, for second half of the journey,

$v_2=\frac{\frac{d}{2}}{t_2}\\\\v_2=\frac{\frac{40t_1}{2}}{\frac{2}{3}t_1}\\\\v_2 = 30~m/s$