All categories

3 years ago

A boy throws a ball vertically up and catches it after 3 s. What height did the ball reach?

Physics

2 answers:

Crazy boy [7]3 years ago

7 0

Answer:

11.025 meters

Explanation:

The gravity’s acceleration on the surface of earth is approximately 9.8m/s

If it took 3 s to go up and come back, that means it took (1/2) × 3 to go from his hand to its highest point, and that amount of time again (1.5 seconds) to go back down to his hand.

This means the ball accelerated from Vi (initial Velocity) to 0 in 1.5 s

To find g in 1.5 i.e speed =

1.5 × 9.8 m/s = 14.7 m/s.

To find the height the ball reached=

We will use d = rt for this. Distance = Rate × Time

Since, it went 14.7 m/s at the start, and 0 m/s at the top, so the average speed of the ball going upward was (0+14.7)/2 = 7.35 m/s

7.35 m/s was the average speed = rate.

Time was 1.5 seconds, so we multiply.

7.35 m/s × 1.5seconds = 11.025 meters

Darya [45]3 years ago

3 0

The top height the ball had is (9/8)*g
g being the strength of the earth's attraction. so if g is about 9.8 then the ball went up about 11 meters

You might be interested in

Can the velocity of a body revese the direction when acceleration is constant?

andriy [413]

Answer:

Yes, the velocity of the object can reverse direction when its acceleration is constant. For example consider that the velocity of any object at any time t is given as: ... At At t = 0 sec, the magnitude of velocity is 2m/s and is moving in the forward direction i.e.v (t) = -2.

7 0

3 years ago

Running with an initial velocity of +11m/s, a horse has an average acceleration of -1.81m/s 2 . How long does it take for the ho

Ronch [10]

Answer:

2.49 seconds

Explanation:

From the question,

a = (v-u)/t............................ Equation 1

Where a = acceleration, v = final velocity, u = initial velocity, t = time

Make t the subject of the equation

t = (v-u)/a.......................... Equation 2

Given: v = 6.5 m/s, u = 11 m/s, a = -1.81 m/s²

Substitute these values into equation 2

t = (6.5-11)/(-1.81)

t = -4.5/-1.81

t = 2.49 s

6 0

3 years ago

Does the charge that flows into the capacitor during the charging go all the way through the capacitor and back to the battery,

snow_lady [41]

The capacitor is used to store electric charge.That is what makes capacitors special. 
The charge that flows into the capacitor is stored on the plate of the capacitor that the source voltage is connected to. When current flows into a capacitor, the charges get “stuck” on the plates because they can’t get past the insulating dielectric. One plate is positively charged and the other negatively The stationary charges on these plates create an electric field. When charges group together on a capacitor like this, the cap is storing electric energy just as a battery might store chemical energy.

8 0

4 years ago

A car starts from rest at a stop sign. It accelerates at 4.6 m/s^2 for 6.2 s , coasts for 2.1s , and then slows down at a rate o

ki77a [65]

Answer:

D = 271.54 m

Explanation:

given,

1. car accelerates at 4.6 m/s² for 6.2 s

2. constant speed for 2.1 s

3. slows down at 3.3 m/s²

distance travel for case 1

using equation of motion

$d_1 = u t +\dfrac{1}{2}at^2$

$d_1 =\dfrac{1}{2}\times 4.6\times 6.2^2$

d₁ = 88.41 m

case 2

constant speed for 2.1 s now, we have to find velocity

v = u + at

v = 0 + 4.6 x 6.2

v = 28.52 m/s

distance travel in case 2

d₂ = v x t

d₂ = 28.52 x 2.1 = 59.89 m

for case 3

distance travel by the car

v² = u² + 2 a s

final velocity if the car is zero

0² = 28.52² + 2 x (-3.3) x d₃

6.6 d₃ = 813.39

d₃ = 123.24 m

total distance travel by the car

D = d₁ + d₂ + d₃

D = 88.41 + 59.89 + 123.24

D = 271.54 m

5 0

3 years ago

A man pushes down on a table. what does the table do to the man?

solong [7]

Question: A man pushes down on a table. what does the table do to the man?

Answer: pushes back against the hand

Explanation: The weight of the ma pushes down on the table with a force mg while the table pushes up on the book with an equal and opposite force

question answered by

(jacemorris04)

3 0

3 years ago

Read 2 more answers