Question

1. A car, travelling at 30m/s slows to 10m/s in 5 seconds. What was the acceleration? A). -6 m/s B) 4m/s C).-2 m/s D). -9.8m/s 2. A ball thrown straight up takes 3 seconds to reach its maximum height. The height is most nearly B). 45m C). 60m D), 90 m A). 30m 3. A driver of a car wishes to pass a truck on the highway. Her car can accelerate at a constant 5m/s'. How long does it take to increase her speed from 30 m/s to 50 m/s? A). 100 s B). 10s C). 6s D).4s 4. A net force of 30 N produces an acceleration of 5 m/s' on a lab cart. Its mass is A), 6 kg B). 0.17 kg C). 3 kg D). 150 kg 5. A net force gives a 10 kg object an acceleration of 2 m/s2. If the same force were applied to a 20 kg object, it would A). travel at a constant 1 m/s. B) accelerates at 4 m/s C). accelerates at 1 m/s D), have a momentum of 20 kg m/s. string at a constant speed of 4 m/s. The 6). A 250 g yo-yo is swung on the end of a 50 em centripetal force acting on the yo-yo is A). 2N B). 4N C). 8N D). 10N 7). When you throw a ball into the air, its kinetic energy A). equals B). equals the work you did on the ball C). is converted to potential energy as it goes higher. D). all of the above. 8). How much work can a 50.0 kg wrecking ball traveling at 5.00 m/s do o the building it strikes? A). 250J B). 625J C), 1250J D). 2500 J 9. An elevator motor did 3000,000.0 J of work lifting a freight elevator (mass- 500.0 kg). If each story is 5.0 m, and the elevator started on the ground floor, what is the highest floor it could reach? A) 60 B). 24 C). 12 D). 5 10. A block of mass (m) is being raised by 3 pulleys. The tension in the cable is

Answer 1

9 V utat Ayu 3