A car with mass 938 kg passes over a bump in a road that follows the arc of a circle of radius 50.4 m. The acceleration of gravity is 9.8 m/s^2.
If the noise is there with out applying the brakes look at the shocks and rear sway bar bushings. Bounce the car with your body weight and see if the car bounces instead of coming back up and stopping. You can disconnect the rear stabilizer bar links and test drive for noise if you want. the rear stabilizer bar bushings are cheap and easy to replace.
check your right brake or make sure the lug nuts are tight
Flattening aluminium foil on carefully, ensuring there are no creases would indeed work. Make sure the duller side is the one glued to the dish though. Other materials would work, but aluminium foil would be the cheapest and easiest to get hold of.
