What is the approximate tangential speed of an object orbiting Earth with a radius of 1.8 x 108 m and a period of 2.2 x 104 s?
co
O 7.7 x 10-4 m/s
5.1 x 104 m/s
7.7 x 104 m/s
5.1 x 105 m/s
O
B

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.