In 3.50 h, a balloon drifts 21.5 km north, 9.70 km east, and 2.88 km upward from its release point on the ground. Find (a) the magnitude of its average velocity and (b) the angle its average velocity makes with the horizontal.n elevator without a ceiling is ascending with a constant speed of 10 m/s. A boy on the elevator shoots a ball directly upward, from a height of 2.0 m above the elevator floor, just as the elevator floor is 28 m above the ground. The initial speed of the ball with respect to the elevator is 20 m/s.
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When To Use Certified Mail. Certified Mail is a special USPS service that provides proof of mailing via a receipt to the sender. With electronic USPS Tracking, the sender is notified when the mailing was delivered or that a delivery attempt was made.Additional options like Return Receipt provide evidence of delivery in the form of a postcard signed by the recipient or an e-mail with an electronic copy of the recipientâs signature.ith electronic USPS Tracking, the sender is notified when the mailing was delivered or that a delivery attempt was made. Additional options like Return Receipt provide evidence of delivery in the form of a postcard signed by the recipient or an e-mail with an electronic copy of the recipientâs signature.