Question

I have no idea why question c is wrong. Please help me

Panth My B Ceng ← → C i https://wwww Ass stadep 20528633 At t o, one toy car is set rolling on a straight track with initial position 15.5 om, initial velocity 3.4 om/s, and constant acceleration 2 00 cme At the same moment, another toy car is set rolling on an adjacent track with initial position 9.0 cm, initial velocity 4.80 cm/s, and constant zero acceleration a) At what time, if any, do the two cars have equal speeds? (Enter NA if the cars never have equal speeds) (b) What are their speeds at that time? (Enter NA if the cars never have equal speeds.) 4.8 ( (c) At what time(s), if any, do the cars pass each other? ( pass, enter NA in both blanks.) 1.07 Your response differs from the correct answer by more than 10% Double check your cakulation 3.02 there is only one time,enter NA in the second tian. I threare tetes anter te snualer Sn Your response differs from the correct answer by more than 10%. Double check your cacu ort. I re tee posten, ate-aanotott meme ) what are their locations at that time? (If there is only one position enter na in the second bank, rther enter NA in both blanks) 14.13 Your response is within 10% of the correct value. This may be due to ronden enoe or rou coda have amane in yar anuaien ar rse a atan na four-digit accuracy to minimize roundoff erroc cm same Your response differs from the correct answer by mora thian 10%. Double check your calulations on (e) Explain the difference between question (a) and question (c) as clearly as possiblde Te velocity of car A ๒ 1o the let with an increasing speed hom ons Is speed is increasing at the rate of 2 30 vs eery second Sinca ts starting poirs is to the right of car B it wil meet car B only once For both cars to havs te s speed car ease to that of car B.ch is 520cms Both cars because both are moveg can have the same speed BUT their velocity is diferent in different directions (car A to to leh, and car B to the right) A's speed must (

Answer 1

Based upon the concept of relative velocity

Based upon the concept of relative velocity As the toy cars are moving towards each other hence their relative speeds with respect to each other relative speeds with respect to each other in given by adding their speeds with respect to ground hence their initial relative speed is V_AB = A_A + V_B = (3.4 + 4.8) cm/s = 8.2 cm/sec acceleration a = that of car A = 2.00 cm/s^2 distance between them to be covered is S = 15.5 cm - 9.0 cm = 6.5 cm suppose they meat after time 't' hence using 2nd equation of motion S = ut + 1/3 at^2 6.5 = 8.2t + 1/2 times 2.00 t^2 = > t^2 + 8.2t - 6.5 = 0 = > t = -8.2 + squareroot (8.2)^2 - 4(-6.5)/2 times 1 (as time can never be -ve) = -8.2 + squareroot 67.24 + 26/2 = 0.728 sec and they pass each other only once therefore other answer is NA \r\n distance travelled by