Question

A 0.155 kg arrow is shot upward

Answer 1

Answer:

2.43J

Explanation:

Given parameters:

Mass of the arrow = 0.155kg

Velocity = 31.4m /s

Unknown:

Kinetic energy when it leaves the bow = ?

Solution:

The kinetic energy of a body is the energy in motion of the body;

 it can be derived using the expression below:

 

   K.E  = $\frac{1}{2}$  m v²

m is the mass

v is the velocity

 Solve for K.E;

    K.E  =  $\frac{1}{2}$  x 0.155 x 31.4 = 2.43J

Answer 2

Answer:

KE = ½mv² = ½(0.155)(31.4)² = 76.4 J

Explanation: