A runner accelerates at a rate of 3a from a velocity of 2V to 4V. Solve for: a) the time for this acceleration to occur

b) the distance traveled by the runner

Athermometer is removed from a room where the temperature is 70° f and is taken outside, where the air temperature is 10° f. after one-half minute the thermometer reads 60° f. what is the reading of the thermometer at t = 1 min? (round your answer to two decimal places.) ° f how long will it take for the thermometer to reach 30° f? (round your answer to two decimal places.)

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?

What do we mean by the event horizon of a black hole?