8 positive x-axis must be in the range A) 0 to 90 B) 90 to 180 C)180 to 270 9) A

Question

8 positive x-axis must be in the range A) 0 to 90 B) 90 to 180 C)180 to 270 9) A car is moving with a velocity (30 m-(1.0mly and 2.5 seconds tater its velocity is (60ms .aomisy. What is the magnitude of the averagacolennon or A) 0.82 m/s2 B) 6.2 m/2 C)16 m/s2 D) 45 m/2 E 20 m2 10) For general projectile motion, the vertical component of a projactile's acceleration A) continuously increases C) remains a non- zero constant B) is zero. D) any of the above, depending on position. 11) For general projectile motion, which statement is true when the projectile is at the highest point of its trajectory? A) Its acceleration is zero. B) Its velocity and accel eration are both zero. C) Its horizontal component of its velocity is zero. D) Its velocity is perpendicular to the acceleration

Explanation / Answer

8) given that Ax > 0 and Ay >0

i.e Ax is positive and Ay is also positive

means that the resultant vector lies in first quadrant

first quadrant lies in the angle range 0 deg to 90 deg

hence the answer is A) 0 deg to 90 deg

9) x-component of average accelaration is ax = (6-3)/2.5 = 1.2 m/s^2

similarly ay = (3-1)/2.5 = 0.8 m/s^2

then a = sqrt(ax^2+ay^2) = sqrt(1.2^+0.8^2) = 1.44 m/s^2

so the answer is C) 1.6 m/s^2

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