A 50 grams ball strikes a wall with a speed v1 = 15 m/s (to the right side) and bounces off with a speed V2 =5 m/s (to the left side) from a wall. If the ball is in contact with the wall for only 0.04 s, then the magnitude of the average force (in N) exerted on the ball by the wall is: O 25 O 50 O 75 O 100
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