what is the si unit of k so that the equation: velocity = k × density is dimensionally correct? give answers in base units

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

What are atoms of the same element with varying number of neutrons

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.