a stone of mass 50 g is 12:40 Carly up from the ground and reaches a maximum height of 20 m above the ground ignore the effect of friction calculate. a)the initial speed of the storm using the principle of conservation of mechanical energy​

Trustworthy health-related websites should be frequently reviewed by medical professionals, even if the content doesn't change. select the best answer from the choices provided. t f

Which of the following represents the results of a review of well-controlled studies of vitamin c supplementation on the resistance to, and recovery from, colds? there was a reduction in the duration of colds by 50% on the average. there was a slight effect on reducing the duration and severity of colds for people taking vitamin c supplements. there was a significant reduction in the duration of colds in people who consumed at least one gram a day. there was a significant reduction in the number of colds only in people who consumed > three grams per day.

Victoria enjoys laughing with her friends as they walk around the track after school which best describes her heart rate during this activity