Question

The kinetic energy (in joules) of a moving object can be calculated from the expression 1/2mv^2, where m is the mass of the object in kilograms and v is its speed in meters per second. Find the kinetic energy of a 0.145 - kg baseball that is thrown at a speed of 40 meters per second. E= ? Joules

Answer 1

1/2×0.145×40²
1/2×0.145×1600
1/2×232
232/2
116 Joules

Answer 2

Answer: $116\text{ joules}$

Step-by-step explanation:

Given: Mass of baseball=0.145 kg

Speed of baseball=40 meters per second

Also it is given that The kinetic energy (in joules) of a moving object can be calculated from the expression $\frac{1}{2}mv^2$ , where 'm' is the mass of the object in kilograms and 'v' is its speed in meters per second.

Thus, the kinetic energy of baseball=$\frac{1}{2}(0.145)(40)^2$

$\frac{1}{2}(0.145)(1600)=116\text{ joules}$