1)a ball is thrown horizontally off a cliff with a speed of 30 m/s.assuming that

Question

1)a ball is thrown horizontally off a cliff with a speed of 30 m/s.assuming that air resistance is negligible, what is the x componentof the acceleration? assume a standard coorinate system where the xaxis is horizontal and the y axis is vertical?

2)two vectors A B have a magnitude related by the scalar equationA=3B. the direction of each vector is unknown. what values arepossible for the magnitude of the resultant wector, A+B?

3)which of the following is necessarily true?
a)the acceleration of the ball is constant as the ball movesupward
b)the velocity of the ball is same throughout ball's flight
c)the x component of velocity of ball is same throughout ball'sflight
d)both a and b
e)both a and c

Explanation / Answer

(a). the x component of the acceleration = 0 since the x-component of velocity doesnot change with timebecause there is no force acting in x - direction . (b). possible values of A + B are in between ( A + B )   to ( A - B )                                                          i.e. ( 3 B+ B ) to ( 3 B - B )                                                                      4 B to 2 B (c). both a and c

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