Question

3. The kinetic energy of an object of
mass, m moving with a velocity
of 5 ms-' is 25 J. What will be its
kinetic energy when its velocity
is doubled? What will be its
kinetic energy when its velocity
is increased three times?
sto
TH
​

Answer 1

The kinetic energy of an object of mass m moving with a velocity of 5m/s is 25J What will be its kinetic energy when its velocity ... When it's velocity is increase three times.

let the mass be m

v = 5m/s

K.E = 25 J

K.E = 1/2 mv^2

25 = 1/2 m (5)^2

25 x 2 = 25m

m = 2 kg

Now if the velocity becomes 3 times then the velocity is 3 x 5 = 15m/S

Now new K.E = 1/2 x 2 x 15^2

= 225 J

Answer 2

Explanation:

let the mass be m

v=5m/s

K.E = 1/2 m v ^2

25=1/2 m (5) ^2

25 × 2 = 25

m=2kg

now if the velocity becomes three times then the velocity is 3×5= 15/seconds

now new K.E =1/2×2×15^2 = 225 J.