6.) Neglecting air resistance, what maximum height will be reached by an arrow l

Question

6.) Neglecting air resistance, what maximum height will be reached by an arrow launched straight upward with an initial speed of 35 m/s? A) 98 m B) 160 m C) 41 m D) 63 m E) 18 m 10 Points 7.) An elevator is moving upward with a speed of 11 m/s. Three s upward, but its speed later, the elevator is still moving has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval? A) 2.0 m/s, upward B) 2.0 m/s2, downward C) 5.3 m/s, upward D) 5.3 m/s', downward E) 2.7 m/s, downward 15 Points 50

Explanation / Answer

6.

At maximum Height final velocity V=0 ,from

V2=Vo2-2gHmax

=>0 =352-2*9.8*Hmax

Hmax=352/19.6

Hmax=62.5 m =63 m

7.

From

V=Vo+at

5 =11+a(3)

a=(5-11)/3 =-2 m/s2

a=2 m/s2 ,downward

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