13. A powerful motorcycle can accelerate from rest to 26.8 m/s (100 km/h) in only 3.90s. What is its average acceleration

Which of the following represents an upside-down image?

What do you think car designers do if the damage caused by a crash test is too severe?

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?