EXAM#1 09/27/17 The following formulas and constant may be useful 1. Average vel

Question

EXAM#1 09/27/17 The following formulas and constant may be useful 1. Average velocity: v = a OR In terms of initial and final quantities, -- 2, Average acceleration: a 4. Equations of uniformly accelerated motion: a a 2 3, Take the acceleration due to gravity, g = 10 me 2) d=vot + ½ at2 Instructions: Show your work in the spaces provided( 50 % of the points ] Circle the Letter that coresponds to the correct option( 50 % of the points), When you walk at an average speed of 2 m/s, in 5 s you'll cover a distance of A. 20 mm 1. 15 m C. 10 m If a car increases its velocity from zero to 30 m/s in 10 seconds, its acceleration is A. 3 m/s2 2. B. 6 m/s2. C. 60 m/s D. 600 m/s changes its speed from rest to 100 m/s in 10 s. During this interval its acceleration is C. 1 m/s2 D. none of the above A. 10 m/s2 zero A car's velocity 1 second after accelerating from rest at 2 m/s? is A. 6 m/s 4. C. 3 m/s D. 2 m/s B. 4m/s

Explanation / Answer

1) distance = speed*time

= 2*5 = 10 m

option C)

2) a = dv/dt = (30-0)/10 = 3 m/s2

option A)

3) 100 - 0 /10 = 10m/s2

option A)

4) v = a*t = 2*1 = 2 m/s

option D)

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