9. If the object is thrown horizontally, the direction and magnitude of its acce
ID: 1778012 • Letter: 9
Question
9. If the object is thrown horizontally, the direction and magnitude of its acceleration while it is in the air is (A) upward and decreasing (B) upward and constant (C) downward and decreasing (D) downward and increasing (E) downward and constant Three objects can only move along a straight, level path. The graphs above show the position d of cach of the objects ploited as a function of time t. 10, Balls I and 2 are each thrown horizontally from the same height ahove level ground, but ball 2 has a greater initial velocity after leaving the thrower's hand. If air resistance is negligible, how do the accelerations of the balls and the times it takes them to hie the ground compare? 6. The magnitude of the velocity of the object is increasing in which of the cases? (A) Il only (B) IlI only (C) I and Il only (D) 1 and IlIl only (E) 1. II, and I1I Acceleration a (A) Greater for ball 2 (B) Greater for hall 2 (C) Equal (D) Equal (E) Equal Greater for ball 2 Equal Greater for ball 2 Less for ball 2 Equal 7· The acceleration on the object is zero in which of the cases? (A) Il only (B) IlI only (C) I and Il only (D) 1 and IIl only E) I II, and IIl 11. A ball is thrown with an initial speed of 20 m's at an angle of 60 to the ground. If air resistance is negligible. what is the ball's speed at the instant it reaches its maximurs height from the ground? (A) Zero (B) 10 m/'s (C) 14 m's (D) 17 m/s (E) 20 m/s An object is thrown with an initial sperd v near the surface of Earth. Assume that air resistance is negligible and the gravitational field is constant & If the ohject is thrown vertically upward. the direction and magnitude of its acceleration while it is in the air is (A) upward and decreasing (B) upward and constant (O downward and decreasing (D) downward and increasing (E) downward and constantExplanation / Answer
6)
Answer : C) III only
In the graph III , velocity is increasing.
7)
Answer: C) I and II only
In graph I velcoity is constant , so acceleration is zero.
In graph II posion is constant, so acceleration is zero.
8)
E) Downward and constant
Direction of acceleration due to gravity is always downwards and is constant.
9)
E) Downward and constant
As the object has only vertical acceleration but not horizontal acceleration.
10)
E) Equal
Both acceleration due to gravity and time taken to reach the bottom are equal for the two objects as the initial vertical velocity of the objects is zero .
S=uy t+(1/2)gt2 (uy =0 )
t=2S/g
11)
A) Zero
When the ball reaches its maximum height, speed of the ball is zero.
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