A toy car is moving along with 0.40 joules of kinetic energy. If its speed is doubled, then its new kinetic energy will be . a. 0.10 J b. 0.20 J c. 0.80 J d. 1.60 J e. still 0.40 J

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

Could we see a galaxy that is 20 billion light-years away?