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11111nata11111 [884]
4 years ago
9

outward from a wall just above floor level. A 1.5 kg box sliding across a frictionless floor hits the end of the spring and comp

resses it 6.5 cm before the spring expands and shoots the box back out. How fast was the box going when it hit the spring?
Physics
1 answer:
sweet [91]4 years ago
3 0

Answer:

v = 0.489 m/s

Explanation:

It is given that,

Mass of a box, m = 1.5 kg

The compression in the spring, x = 6.5 cm = 0.065 m

Let the spring constant of the spring is 85 N/m

We need to find the velocity of the box (v) when it hit the spring. It is based on the conservation of energy. The kinetic energy of spring before collision is equal to the spring energy after compression i.e.

\dfrac{1}{2}mv^2=\dfrac{1}{2}kx^2

v=\sqrt{\dfrac{kx^2}{m}} \\\\v=\sqrt{\dfrac{85\times (0.065)^2}{1.5}} \\\\v=0.489\ m/s

So, the speed of the box is 0.489 m/s.

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Answer:

\huge\boxed{True.}

Explanation:

This is true because gravity is independent of mass. Whether it's a heavy or a light object, when dropped, they both will hit the ground at the same time. The reason is that gravity does not depend on mass.

Hope this helped!

<h2>~AnonymousHelper1807</h2>
4 0
3 years ago
an object is moving with a velocity 10 m/s but its slowing down.After 2m it has stoppes.What was the acceleration?​
s344n2d4d5 [400]

Answer:

Explanation

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time= 2m/(10m/s) =0.2s

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5 0
4 years ago
a block is suspended 5 m above the ground if the block has a mass of 20 kg how much potential energy is stored in the block (g=
ozzi

Answer:

P.E = 980 Joules

Explanation:

Given the following data;

Mass = 20 kg

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To find the potential energy stored in the block;

Mathematically, potential energy is given by the formula;

P.E = mgh

Where,

P.E represents potential energy measured in Joules.

m represents the mass of an object.

g represents acceleration due to gravity measured in meters per seconds square.

h represents the height measured in meters.

Substituting into the equation, we have;

P.E = 20 * 9.8 * 5

P.E = 980 Joules

3 0
3 years ago
A unit for measuring frequency is? ohm watt ampere hertz
pishuonlain [190]

"Frequency" is a measure of how frequent something is.

Its unit is the "Hertz".

1 Hertz  =  1 per second

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