An alpha particle with charge +2.0 e is sent at high speed toward a copper nucleus with charge +29 e. What is the electric force acting on the alpha particle when the alpha parti- cle is 1.5 x 10 m from the copper nu- cleus? The value of the Coulomb constant is 8.99 x 109 N·m²/C2. 14 Х m

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.