An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at +15.0 m/s2. At t1 the rocket engine is shut down and the sled moves with constant velocity v until t2. The total distance traveled by the sled is 5.30 103 m and the total time is 89.0 s.
Find tl.
_____s
Find t2.
_____s
Find v.
_____m/s
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A parachutist descending at a speed of 10.0 m/s loses a shoe at an altitude of 50.0 m. (Assume the positive direction is upward.)
(a) When does the shoe reach the ground?
______s
(b) What is the velocity of the shoe just before it hits the ground?
______ m/s
2007-05-24
14:28:46
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1 answers
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asked by
Johnson
2
in
Science & Mathematics
➔ Physics