iPad 21 757 p.m. webassign net PH101 Homework Assignment 2 Serway, Physics A tru

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iPad 21 757 p.m. webassign net PH101 Homework Assignment 2 Serway, Physics A truck covers 40.0 m in 7.25 s while uniformly slowing down to a final velocity of 2.3S m/s. (a) Find the truck's original speed. m/s (b) Find its acceleration. m/s2 Need Help? Read It iChat About It -1 points SerCP92 P050 A small mailbag is released from a helicopter that is descending steadily at 1.51 m/s. (a) After 3.00 s, what is the speed of the mailbag? m/s (b) How far is it below the helicopter? (c) What are your answers to parts (a) and (b) if the helicopter is rising steadily at 1.51 m/s? m/s Need Help? Read iChat About It My Notes 50% Ask Your Teacher

Explanation / Answer

a) v = u +at

2.35 = u + a(7.25)

and v^2 - u^2 = 2as

2.35^2 - u^2 = 2(2.35 - u )40 / 7.25

u^2 - 11.03u + 20.41 = 0

u = 8.68 m/s

b) a = 2.35 - 8.68 / 7.25 = - 0.873 m/s2

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