I need solve this questions MCQ

Q10 1) A 1000-kg car traveling initially with a speed of 20 m/s in an eastern direction crashes into the rear end of 2000-kg truck Q4 moving in the same direction with a speed of 10 m/s. The velocity of the car right after the ) In a harmonic oscillator, the spacing collision is 15 m/s to the east. What is the energy AE between the quantized energy levels velocity of the truck after the collision? is 4 eV. What is the energy of the ground state? O a. 12.5 m/s O a. lev O b. 0m/s O b. 2ev O c. 2.5 m/s O c. 4ev O d. 7.5m/s O d. 0ev Q3 Question 5 ) The ground state and the first three excited states of this harmonic oscillator are occupied. How many different photon energies will appear in the emission spectrum? ) Which choice in the list below corresponds to a correct unit of Planck's constant? O a. eV/s O b. J/s O c. J.s2 O a. 3 O d. eV.s O b. 4 O C. 6 Od. 1