1:Which of the following could be a velocity? Select one: a. 5 meters east b. 5

Question

1:Which of the following could be a velocity?

Select one:

a. 5 meters east

b. 5 hours west

c. 5 meters per second

d. 6 meters per second north

e. none of above

2:If two balls are thrown from the same cliff with the same speed, one up, one down, when they touch the ground, they should:

Select one:

a. have different speed

b. the same speed

c. touch the ground in the same time

d. travel the same distance in the air

e. none of above

3:If two balls are thrown down from the same cliff with the same speed, one big ball, one small ball, if ignore the air resistance:

Select one:

a. they should touch the ground at the same time

b. they should touch the ground at different time

c. they should touch the ground at different speed

d. they should touch the ground at different acceleration

e. none of above

4:If a car changes speed from 60 mph to 66 mph in 1 minute, its average acceleration is : ( in m/s^2)

Select one:

a. 6

b. 120

c. 10

d. 60

e. none of above

5:If a car changes speed from 160 m/s to 280 m/s in 1 minute, its average acceleration is ( in m/s^2)

Select one:

a. 60

b. 1

c. 2

d. none of above

Explanation / Answer

1. d) 6 meters per second north   

as velocity is a vector , so both magnitute and direction should be present

2) b) Both balls hit with the same speed.

The ball thrown up decelerates as it goes up and then begins to accelerate as it comes down, attaining the same speed as it passes the thrower that it was thrown, it then continues to accelerate to match the ball that was thrown down.

3) a) they should touch the ground at the same time

they will both drop to the ground at around the same time because the weight doesnt matter what matters is the way gravity works.

4) e) none of the above

change in speed = 6 mph = 2.68224 meter per sec which takes place in 1 minute

so acceleration = 2.68224/60 =0.044 m/s^2

5) c) 2 m/s^2

similary acceleration = chenge in velocity/ time = 280-160/ 60 = 2 m/s^2

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