12. answer the following questions using the velocity and time graph above. a. at what time(s) was the car stopped? b. at what time(s) was the car maintaining a constant velocity? c. at what time(s) did the car accelerate? d. at what time(s) did the car have a negative acceleration?

A. 0 and .7 to .8

B. .2 to .4, and 1 to 1.1

C. 0 to .2, and .8 to 1

D. .4 to .7

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

prndulum needs thread, weight clock to time swings