Question

I’m so confused about this question. Could anyone pleease explain to me how to solve these kinds of questions?

Answer 1

Answer: 3.3m/s

Step-by-step explanation:

kinetic energy=0.5*m*v^2

5.0m/s(^-1)=0.2

0.2^2=0.04

0.5*5000kg*0.04m/s=100J

0.5*2500kg*v^2=100J

Rearrange the equation:

100/0.5*2500=v^2

0.08=v^2

√0.08=v^2

0.28=v

Combined velocity= 1st lorry+2nd lorry=3.3m/s