Question

I need help!!

Answer 1

A ball that is thrown up in the air reaches its maximum height. What would its acceleration be at its maximum height?
Question 7 options:

1) 9.8 m/s² [down]

2) 9.8 m/s² [up]

3) < 9.8 m/s² in magnitude

4) > 9.8 m/s² in magnitude

5) 0 m/s²

Answer 2

@zepdrix

Answer 3

@mathstudent55 @mathmale

Answer 4

0 because at the maximum heightthe velocity is 0

Answer 5

But it is 9.8 down

Answer 6

so it be 9.8 down right

Answer 7

@isaidavila

Answer 8

A truck is driving along the highway behind a tractor when it pulls out to pass. If the truck's acceleration is uniform at 2.0 m/s² for 4.0 s and it reaches a speed of 28 m/s, what was its speed when it first pulled out to pass the tractor?
Question 4 options:

1) 24 m/s

2) 20 m/s

3) 18 m/s

4) 22 m/s

5) 26 m/s

Answer 9

@NatsuOniKaze @LoveIt @inkyvoyd

Answer 10

@Data_LG2

Answer 11

@GracieBugg

Answer 12

help me plz

Answer 13

@ParthKohli

Answer 14

here we can apply this formula:
\[\huge v = {v_0} + at\]
so, we can write:
\[\huge {v_0} = v - at = 28 - \left( {2 \times 4} \right) = ...?\]

Answer 15

I get 20

Answer 16

@Michele_Laino

Answer 17

The term "uniform motion" means
Question 1 options:

1) acceleration is constant

2) displacement is constant

3) velocity is constant

4) velocity is zero

5) speed is constant

Answer 18

that's right! It is \(20\) meters/second

Answer 19

is it be 3

Answer 20

for # 1

Answer 21

I think it is option #5
Please think about the uniform circular motion, wherein the point has constant speed

Answer 22

whereas the velocity is not constant

Answer 23

well thanks a lot @Michele_Laino I appreciated

Answer 24

:)