Question

2. Calculate the kinetic energy of an object ofmass 20 kg if its momentum is 40 kg m/s. (1 point)A. O 62.497 JB. O 40 JC. O 29.044 JD. O 44.934 J48.953 JE.3. After a bullet of mass 0.055 kg is fired into aballistic pendulum of mass 4 kg, the bullet is embeddedin the pendulum and the pendulum rose to a height of 0.01 m.Calulate the speed of the pendulum just after the collision. (1 point)A.0.443 m/sB.0.125 m/sC.0.713 mD.0.794 m/sE.0.344 m/s4. After a bullet of mass 0.03 kg is fired into aballistic pendulum of mass / kg, the bullet is embeddedin the pendulum and the com

Answer 1

2. Given

Mass of the object, m=20 kg

Momentum, p=40 kgm/s

To find

The kinetic energy of the object

Step-by-step explanation

We know the momentum is

`\begin{gathered} p=mv \\ \Rightarrow40=20v \\ \Rightarrow v=2\text{ m/s} \end{gathered}`

Now the kinetic energy is

`\begin{gathered} K=(1)/(2)mv^2 \\ \Rightarrow K=(1)/(2)*20*2^2 \\ \Rightarrow K=40\text{ J} \end{gathered}`

Step-by-step explanation

The kinetic energy is B.40 J.