The speed of cars at A and B will be 25 m/sec.
Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while v for the final speed. its si unit is m/sec.
Given data;
Mass of roller coaster,m =750 kg
Height at location 1,h₁ = 40 m
Height at location 2,h₂ = 302 m
The velocity of car A,[tex]\rm v_A[/tex]
The velocity of the car B, [tex]\rm v_B[/tex]
The velocity of the car A and B is the same is found as;
[tex]\rm v_A = v_B = v = \sqrt{v_0^2 + 2g(h_1-h_2} )\\\\ v = \sqrt{15^2 + 2 \times 10 (40-30)} \\\\ v = \sqrt{225+400} \\\\ v = 25 \ m/sec[/tex]
Hence the speed of cars at A and B will be 25 m/sec
To learn more about the speed refer to the link;
https://brainly.com/question/7359669
#SPJ1
