2/11 Ball 1 is launched with an initial vertical velocity v1 = 160 ft/sec. Three seconds later, ball 2 is launched with an initial vertical velocity v2. Deter- mine v, if the balls are to collide at an altitude of 300 ft. At the instant of collision, is ball 1 ascending or descending?

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Nilo

Q6. As shown in the image below, the spring (with spring constant k = 2.4 kN/m) is fixed to block A, and block B is pressed against the spring. The masses of blocks A and B are mà = 19 kg and m² = 15 kg, respectively. The spring is initially compressed by 240 mm, and then both blocks are released from rest. Determine the velocity of block A at the instant block B loses contact with the spring. Right is considered the positive direction and negative sign must be included if the velocity points to the left. (Hint, neglect friction, and since there is no impulsive force, energy is conserved.) Please pay attention: the numbers may change since they are randomized. Your answer must include 3 places after the decimal point, and proper SI unit. Your Answer: Answer A www k units B