Question

A 3-kg toy cart is moving at 4 m/s. Calculate the kinetic energy of this cart if it were moving TWICE as fast.

Answer 1

Answer:

96 J

Explanation:

KE = (1/2) mv^2

m= 3kg

v= 4 m/s

(We have to calculate the KE of the cart when it is moving twice as fast, so 4x2=8, v=8m/s.)

KE = (1/2)(3kg)(8^2) = 96J

Answer 2

The kinetic energy of the cart moving with twice speed is 96 Joules.

Kinetic Energy

The kinetic energy of an object of mass m and velocity v is given below.

$KE = \dfrac {1}{2}mv^2$

Given that the mass of the toy is 3 kg and velocity is 4 m/s. The kinetic energy of the cart which is moving twice its original speed is given below.

$KE = \dfrac {1}{2}m\times (2v)^2$

$KE = \dfrac {1}{2}\times 3\times (2\times 4)^2$

$KE = 96 \;\rm J.$

Hence we can conclude that the kinetic energy of the cart moving with twice speed is 96 Joules.

To know more about kinetic energy, follow the link given below.

https://brainly.com/question/999862.