q14

Asked by nilesh.dhote74 | 28th Apr, 2020, 09:41: PM

Expert Answer:

Hint
Here both the cars are similar. Consider masses similar
 
Recall the formula of KE = 1/2(mv2)
 
Here the speed has some direction, consider it has velocity.
 
Apply the formula and equate further.
 
You will get something like
KE car1 : KE Car 2
1/2m x 152 = 1/2m x 45
On simplification, this reduces to 1:9
 

Answered by  | 28th Apr, 2020, 10:02: PM