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2 years ago

Explain why the teenager and the wheelchair don't have the same kinetic energy, even though they have the same speed

Physics

1 answer:

Likurg_2 [28]2 years ago

7 0

Answer:

their weight difference

Explanation:

weight adds to kinetic energy. a heavier object will have a higher kinetic energy because the extra weight will slowly increase or decrease the velocity depending on if it's being sent down a decline or inclined plane

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What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a

Nutka1998 [239]

The acceleration of the ball is 5 m/s^2. This can be calculated using a formula that relates the change in velocity, acceleration, and time. This formula is:

Vf = Vi + at

where:
Vf = final velocity
Vi = initial velocity
a = acceleration
t = time

Substituting the values gives:

30 = 20 + a(2)
a = 5 m/s^2 --> Final Answer

6 0

3 years ago

The action that has the ability to change the motion of an object is

Troyanec [42]

The answer to this question is force

3 0

3 years ago

A traffic light of weight 100 N is supported by two ropes that make 30-degree angle with the horizontal. What is the vertical co

alina1380 [7]

Answer:

$T_{vertical} = 50 N$

Explanation:

given,

traffic light weight = 100 N

angle at which the rope is supported = 30°

vertical component of force = ?

$2 T sin \theta= W$

$2 T sin 30^0= 100$

$T = \dfrac{100}{2 sin 30^0}$

$T = 100\ N$

$T_{vertical} = T sin 30^0$

$T_{vertical} = 100\times \dfrac{1}{2}$

$T_{vertical} = 50 N$

5 0

3 years ago

If a car is traveling at 35 mph how far will the car travel in 2.5 hours

Vanyuwa [196]

Answer:

87.5 miles

Explanation:

d = s * t

d = 35 * 2.5

d =87.5

4 0

3 years ago

Help with these below and the above. I will give brainliest and 20 points!

Juli2301 [7.4K]

height from which it is dropped is 64.8 m

time taken to fall the object is

$h = v_y * t + 0.5 gt^2$

$64.8 = 0 + 0.5 * 9.8 * t^2$

$t = 3.64 s$

so it will take 3.64 s to drop

Since the package is dropped from plane so the package and plane both will have same speed in horizontal direction so with respect to plane the package will always remain in same horizontal position.

Now here since the package is also moving downwards due to free fall so it will always seen as dropped down while we are watching it from the plane

The package appears to fall straight downward.

Let the time trianglet is "t"

now in this interval of time if it falls down by 4 cm

$h = v_y *t + 0.5 gt^2$

$4 = 0 + 0.5* 9.8 * t^2$

$t^2 = \frac{4}{4.9}$

now in same time it covers horizontal distance

$d = v_x * t$

$4 = \sqrt{\frac{4}{4.9}} * v_x$

$v_x = 4.43 m/s$

now after two trianglet the horizontal position will be

$x = v_x * t$

$x = 4.43 * 2*\sqrt{\frac{4}{4.9}}$

$x = 8 cm$

$y = v_y * t + 0.5 g t^2$

$y = 0 + 0.5 * 9.8 * 4 * \frac{4}{4.9} = 16 cm$

so it is 8 cm to the right and 16 cm below

Speed horizontal = 42 m/s

distance covered = 60 ft 6 inch

$d = 60.5 * 0.3048 = 18.44$

time taken to cover the distance

$x = v* t$

$18.44 = 42 * t$

$t = 0.44 s$

now the distance by which it is dropped

$y = \frac{1}{2}gt^2$

$y = 0.5 *9.8*0.44^2 = 0.944 m$

here the velocity of projectile will increase when it will fall under gravity

So here it we can see initially it is moving up against the gravity so its speed will increase but after that its speed will increase when it starts falling down

So the correct answer is Between B to C

when x coordinate is 1000

time taken to reach that point will be

$x = v_x * t$

$1000 = 50 * t$