Question

Which of the following objects has the most kinetic energy?

A 20 kg toddler running at 5 m/s
A 50 kg toddler running at 30 m/s
A 90 kg toddler running at 30 m/s
A 100 kg toddler running at 2 m/s

Answer 1

first use the Formula K. E. ½mv²=?

1)½×20×5²=250

2)½×50×30²=22500

3)½×90×30²=40500

4)½×100×2²=200

so your answer is object third

Answer 2

Answer:

(C). A 90 kg toddler running at 30 m/s has the most kinetic energy

Explanation:

Formula to find kinetic energy =

$(1/2) * mass * (velocity)^2$

Let variable ,

mass = m

velocity = v

(A) =  $(1/2)*20*(5)^2 = 250 m/sec^2$

(B)  = $(1/2)*50*(30)^2 = 22,500 m/sec^2$

(C) = $(1/2)*90*(30)^2 = 40,500 m/sec^2$

(D) = $(1/2)*100*(2)^2 = 200 m/sec^2$

Hence , Kinetic energy of (C) is maximum.

#SPJ3