Problem 4: During a snowball fight two balls with respective masses of 1.6 and 0.4 kg are thrown in such a manner that they meet with their velocities forming a 30 degree angle. After the collision, the two snowballs combine to form a single mass. The speed of each snowball just beforethe collision is 15 m/s. (a) The speed of the combined snowball immediately after collision is ________ (b) The kinetic energy of the combined snowball (with mass 2 kg) is ________

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