Part-I: Answer the following 10 multiple choice questions: (10 x 6 60 pts) 1. Wh

Question

Part-I: Answer the following 10 multiple choice questions: (10 x 6 60 pts) 1. When can we be certain that the average velocity of an object is always equal to its instantaneous velocity? A) always B) never C) only when the velocity is constant D) only when the acceleration is constant Ans: 2. The displacement can be A) positive B) negative C) both positive and negative D) none Ans. 3. The value of an object's acceleration may be characterized in equivalent words by which of the following? A) displacement B) rate of change of displacement C) velocity D) rate of change of velocity Ans: 4. The motion of a particle is described in the velocity versus time graph shown in the figure.

Explanation / Answer

1)

If the object moves with constant velocity, then the

velocity is same at every point

average velocity = instantaneous velocity

OPTION C <<<<--------answer

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2)

displacement dx = xf - xi

x can be either positive or negative

so diplacement can be either positive or negative

OPTION (C)

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3)

acceleration is defined as rate of change in velocity

OPTION (D)

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4)

slope of the graph gives acceleration

In the graph slope is constant and positive

acceleration has positive value

acceleration a = (vf- vi)/dt

Initially the particle is moving in negative direction

the speed decreased to 0 and then increased in positive direction

OPTION (D)

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5)

velocity is vector . so it can be positive or negative

OPTION (C)

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6)

acceleration a = (v2 - v1)/t

acceleration is positive, the speed is increasing

acceleration is negative it is called deceleartion , the speed is decreasing

OPTION (B) and (A)

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7)

g = 9.8 m/s^2

OPTION (C)

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8)

velocity is defined as rate of change in velocity

OPTION (D)

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9)

acceleration = rate of change in velocity

At point A and C the direction is changing so the object has acceleration

at point C the speed and direction is constant

so the velocity is constant

acceleration is zero

OPTION (B)

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10)

cm/s2

OPTION (D)

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