Answer:
Option B. 2.0 kg
Explanation:
Data obtained from the question include:
V = 20m/s
K.E = 400J
m =?
K.E = 1/2 mV^2
400 = 1/2 x m x (20)^2
400 = 1/2 x m x 400
400 = m x 200
Divide both side by 200
m = 400/200
m = 2kg
The mass of the object is 2kg
Answer:
2 Kg
Explanation :
∵ Kinetic Energy = 1/2×(mass of object)×(velocity)²
given Kinetic Energy = 400 Joules
velocity = 20 m/s
putting this given value of kinetic energy & velocity in the above equation
400 = 1/2×(mass of object)×(20)²
∴ mass of object = (400×2)/400
mass of object = 2 Kg.
Hence option B is the correct answer
