If you pluck both strings at the same time at the beam, what is the time delay between the arrival of the two pulses at the ceiling

Plss anybody know how to do this? ? i need the answers from a through d

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?