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ZanzabumX [31]
3 years ago
15

An object has a velocity of 8 m/s and a kinetic energy of 480 J. What is the mass of the object? Formula=1/2mv^2 a(7.5 b(15 kg c

(60 kg d(120 kg
nevermind i found the answer its (15 kg) because to solve for m its m= K2/v squared
Mathematics
2 answers:
sveticcg [70]3 years ago
8 0

Hello!

An object has a velocity of 8 m/s and a kinetic energy of 480 J. What is the mass of the object ?

We have the following data: 

KE (Kinetic Energy) = 480 J

m (mass) = ? (in Kg)

v (speed) = 8 m/s

Formula to calculate kinetic energy:

\boxed{KE = \dfrac{1}{2}*m*v^2}

Solving:

KE = \dfrac{1}{2}*m*v^2

480 = \dfrac{1}{2}*m*8^2

480 = \dfrac{1}{2}*m*64

480*2 = 64*m

960 = 64\:m

64\:m = 960

m = \dfrac{960}{64}

\boxed{\boxed{m = 15\:Kg}}\end{array}}\qquad\checkmark

Answer:  

b) 15 kg

_______________________________

I Hope this helps, greetings ... Dexteright02! =)

SpyIntel [72]3 years ago
7 0
The Kinetic Energy (K.E) of an object can be calculated as:

K.E= \frac{1}{2}mv^{2}

We are given:
K.E = 480 K
Velocity of the object = v = 8 m/s

Using the values, we get:

480= \frac{1}{2}m(8)^{2}  \\  \\ 
480= \frac{1}{2}*64m \\  \\ 
480=32m \\  \\ 
m=15


Thus, the mass of the object will be 15 kg.

So the correct answer is option b
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