Really need with these three similar physics questions as soon as !

1.) you are in paris, 60 m up in the eiffel tower. if you throw a euro downward at a velocity of 2.0 m/s, how long would it take the euro to hit the ground? neglect air resistance.

a. 3.3 s

b. 120 s

c. 41 s

d. 30. s

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2.) a bicyclist passing through a city accelerates after he passes the signpost marking the city limits. his acceleration is constant at 6.0 m/s2. at time t1 = 0 s, he is at x1 = 7.0 m beyond the signpost and has a velocity v1 = 5.0 m/s.

find his position (distance from the signpost) 3 s after passing the signpost (at t = 3.0 s).

630 m
210 m
49 m
39 m

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3.) a bicyclist passing through a city accelerates after he passes the signpost marking the city limits. his acceleration is constant at 6.0 m/s2. at time t1 = 0 s, he is at x1 = 7.0 m beyond the signpost and has a velocity v1 = 5.0 m/s.

find his velocity at t = 3.0 s.

210 m/s
156 m/s
23 m/s
15 m/s

1 ) 3.3 [s]; 2) 49 [m]; 3) 23[m/s]

Explanation:

1)

In this problem we can use the kinematic equations, first we must find the final velocity and the we can calculate the time.

Now using the following equation, we can find the time:

Note: The acceleration is positive because the gravity is acting in the same direction towards the movement.

2)

In this problem, we must identify each of the initial data and then using the ideal kinematic equation we will find the answer.

x0= the initial position = 7[m]

v0= the initial velocity = 5 [m/s]

t = time = 3 [s]

a = acceleration = 6[m/s^2]

x = the final position, after the 3 [s]

Now replacing:

3 ) Is the same problem that problem 2, but we must use another equation.

vf=final velocity [m/s]

v0= initial velocity [m/s] = 5 [m/s]

t= time = 3 [s]

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.