A tennis ball has 22 J of kinetic energy and is moving at 3 m/s. What is the tennis ball’s mass?

the required formula is

Kinetic energy =0.5*m*v^2

given

Kinetic energy =22 J

v=velocity =3m/s

m=mass=?

Explanation:

Explanation:

kinetic energy=half mv×v

22=1÷2m×3×3

22=1÷2m×9

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s