Section 4 [8] 21) A bicycle travels 10 km in 40 min. Its average speed (2pts) is 0 0.25 km/min 0 4 km/min 0 25 km/h 0 400km 22) How long does a car whose acceleration is 2 m/$2 need to go from 10 m/s to 20 (2pts) m/s? 20 0 10 S 0 15 0 55 23) The weight of 4kg of onions is (2pts) 0 0.4 N 0 4N 4kg 39.2 N 24) An upward force of 300 N acts on a 20-kg dumbwaiter. The dumbwaiter's (2pts) acceleration is 6000 m/s^2 D 1.5 m/5^2 0 15 m/502 0 0.67 m/542