#811 T-Mobile 9:58 PM Done 1 of 13 Phy 1 Time 80 minutes Do all (4) problems (..
ID: 776500 • Letter: #
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#811 T-Mobile 9:58 PM Done 1 of 13 Phy 1 Time 80 minutes Do all (4) problems (.. )' ,.fu.,,. 1. A spacecraft is traveling with a velocity of+3200 m's. Suddenly the retrorockets are fired and the spacecraft begins to slow down with an acceleration whose magnitude is 8.0 m/'s 2 What is the velocity of the spacecraft when the displacement of the spacecraft is + 200 km relative to the point where the retrorockets began firing? 2. A diver springs upward with an initial speed of 1.8 m/s from a 3.0 m board. Ignore air resistance during her motion and use g-9.80 m/s Find the velocity with which she strikes the water. (a) Hint: When the diver racherslerareater herdigpalaemenc (measured from the board), assuming that the dounward direction is chosen as the negative direction (b) What is the highest point she reaches above the water ? 15 pts 3. A diver runs horizontally with a speed of 1.20 m/'s off a platform that is 10.0 m above the water. What is his speed just before striking the water? 20 pt The punter on a football team tries to kick a football so that it stays in the air for a long " hang time ". The ball is kicked with an initial velocity of 25.0 m/s at an angle of 600 ° above the ground What is the hang time -the total time the ball is in the air? How far does the ball travel horizontally in this time? 4· 15 (a) (b) 15 9 210Explanation / Answer
1)
Given :-
Vo = 3200 m/s
a = -9.81 m/s^2
x = 200 km = 200000 m
V^2 = Vo^2 + 2ax
V = sqrt(Vo^2 + 2ax)
V = sqrt[ (3200)^2 - 2(9.81 x 200000)]
V = 2513 m/s
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