I need explanations! Not only answers! QUESTION 1* Your car is traveling at 30 m

Question

I need explanations!

Not only answers!

QUESTION 1*

Your car is traveling at 30 m/s when you press the brake. The car stops after 250 m. Assuming that the deceleration is constant, calculate the time to stop.

(a)   16.7 s
(b)   17.25 s
(c)   9.8 s
(d)   35.4 s
(e)   12.9 s

QUESTION 2*

This and the following question concern the same physical situation.

A football player moves along a straight-line path to catch a ball thrown by the quarterback. The graph shows the speed as a function of time. Calculate the acceleration at 1 s, 2.5 s and 4 s.

1 s

2.5 s

4 s

a.

0.5 m/s2

0.0 m/s2

1.0 m/s2

b.

1.0 m/s2

0.0 m/s2

-2.0 m/s2

c.

2.0 m/s2

0.0 m/s2

-1.0 m/s2

d.

2.0 m/s2

1.0 m/s2

-2.0 m/s2

e.

2.0 m/s2

0.0 m/s2

-2.0 m/s2

(a)   
(b)   
(c)   
(d)   
(e)   

QUESTION 3*

How far does the player travel in the interval between t = 2 s and t = 3 s ?

(a)   0 m
(b)   2 m
(c)   4 m

QUESTION 4*

This and the following two questions concern the same physical situation.

A ball is thrown upward from the ground at an initial angle of 60

1 s

2.5 s

4 s

a.

0.5 m/s2

0.0 m/s2

1.0 m/s2

b.

1.0 m/s2

0.0 m/s2

-2.0 m/s2

c.

2.0 m/s2

0.0 m/s2

-1.0 m/s2

d.

2.0 m/s2

1.0 m/s2

-2.0 m/s2

e.

2.0 m/s2

0.0 m/s2

-2.0 m/s2

Explanation / Answer

1,a

2,b

3,a

4,c

5,c

6,a

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