Compare the potencial energy of a 20 kg rock on the edge of 100 cm cliff with that of a 20 kg rock perched on the edge of a 50 cm cliff

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Classify each possible hypothesis about a medicinal aloe vera plant as falsifiable or non-falsifiable. aloe vera gel is the best natural skin moisturizer. aloe vera gel can heal wounds by boosting cell renewal. aloe vera juice tastes better than carrot juice. drinking aloe juice can reduce the risk of lung cancer.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.