Answer:
2.45 × 10^-3 Joules
Step-by-step explanation:
Kinetic energy is the energy assumed by a moving object. The kinetic energy, which is measured in Joules (J) is calculated using the formula:
K.E = 1/2 mv^2
Where K.E= kinetic energy
m = mass ( 0.1 g)
v = velocity (7 m/s)
Since Joules is Kgm^2/s^2, the unit of mass must be kilograms (kg), and velocity must be in metre per seconds (m/s).
Hence, we need to convert 0.1 grams to kg by dividing by 1000
1000g = 1kg
0.1g = 0.1/1000 = 0.0001kg
K.E = 1/2 mv^2
K.E = 1/2 × 0.0001 × 7 × 7
K.E = 1/2 × 0.0049
K.E = 0.00245
Hence, K.E = 2.45 × 10^-3 Joules