3. Thekinetic energy of an object of mass, m moving with a velocity of 5 ms-t is 25 J. What will be its Toinetic energy when

Question

3. Thekinetic energy of an object of
mass, m moving with a velocity
of 5 ms-t is 25 J. What will be its
Toinetic energy when its velocity
is doubled? What will be its
Icinetic energy ruhen its velocity
is increased three times?​

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Nguyệt Ánh 6 months 2021-07-13T17:36:22+00:00 1 Answers 4 views 0

Answers ( )

    0
    2021-07-13T17:37:32+00:00

    Answer:

    1. 100 J

    2. 225 J

    Explanation:

    We’ll begin by calculating the mass of the object. This can be obtained as follow:

    Velocity (v) = 5 ms¯¹

    Kinetic energy (KE) = 25 J

    Mass (m) =?

    KE = ½mv²

    25 = ½ × m × 5²

    25 = ½ × m × 25

    25 = 25m / 2

    Cross multiply

    25m = 25 × 2

    25m = 50

    Divide both side by 25

    m = 50 / 25

    m = 2 Kg

    1. Determination of the kinetic energy when the velocity is doubled.

    Mass (m) = 2 Kg

    Velocity (v) = double the initial velocity

    = 2 × 5 ms¯¹

    = 10 ms¯¹

    Kinetic energy (KE) =?

    KE = ½mv²

    KE = ½ × 2 × 10²

    KE = ½ × 2 × 100

    KE = 100 J

    2. Determination of the kinetic energy when the velocity increased three times.

    Mass (m) = 2 Kg

    Velocity (v) = three times the initial velocity

    = 3 × 5 ms¯¹

    = 15 ms¯¹

    Kinetic energy (KE) =?

    KE = ½mv²

    KE = ½ × 2 × 15²

    KE = ½ × 2 × 225

    KE = 225 J

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