Answered

two cars are moving at constant speeds in a straight line along a major highway. The first is travelling at 20ms^-1 and the second at 28m^-1. If the second car is 6km behind the first car, how much time will it need to catch up with the first car

Answer :

sebasacevedop

Answer:

[tex]t=750s[/tex]

Explanation:

The two cars are under an uniform linear motion. So, the distance traveled by them is given by:

[tex]\Delta x=vt\\x_f-x_0=vt\\x_f=x_0+vt[/tex]

[tex]x_f[/tex] is the same for both cars when the second one catches up with the first. If we take as reference point the initial position of the second car, we have:

[tex]x_0_1=6km\\x_0_2=0[/tex]

We have [tex]x_f_1=x_f_2[/tex]. Thus, solving for t:

[tex]x_0_1+v_1t=x_0_2+v_2t\\x_0_1=t(v_2-v_1)\\t=\frac{x_0_1}{v_2-v_1}\\t=\frac{6*10^3m}{28\frac{m}{s}-20\frac{m}{s}}\\t=750s[/tex]

Other Questions