1a) A car travels 500m in 20s; what is its averge speed?
b) Why is the actual speed of a car not usually the same as its average speed?
Answers
Explanation:
The average speed of car is 25m/s
Answer:
Answer:
most “official” recommendations are that a child is ready for supervised use of a smartphone by age 13. Research also suggests that cell phone exposure could affect children's behavior. ... A 2014 article reviewing studies on children and their cell phone use found that the younger the child, the greater the risk of brain cancer and brain tumors.
There is no strict rule as to when children are “ready” for smart phones. Research has noted children of less than 30 months old cannot learn from videos in the same way as real-life. Therefore, one of the most significant positive factors of using technology does not apply to them.
Around 68% of parents think children should be at least 9 before they get their first phone, and around a third suggesting 12 as a minimum age. Equally, most parents will feel that it is appropriate for teenagers to have access.