Question

Q2. The kinetic energy of a body of
mass 2 kilogramme is 9 Joule its
speed is *
(a) 3m/s
(b) 4m/s
(c) 9 m/s
(d) 5m/s​

Answer 1

Answer:

5m/s is the answer option d I think so

Answer 2

Answer:

( a ) 3 m/s

Explanation:

Given,

Mass ( m ) = 2 kg

Kinetic energy ( K.E ) = 9 J

To find : Speed / Velocity ( v ) = ?

Formula : -

K.E = ( 1 / 2 ) mv^2

K.E = ( mv^2 ) / 2

2K.E = mv^2

v^2 = 2K.E / m

      = ( 2 x 9 ) / 2

v^2 = 9

v = √9

v = 3 m/s