The Sea Serpent coaster was shut down immediately and firefighters used inflatable bags to lift the ride off the child at Playland after the accident, which happened around 9 p.m. Saturday.
Authorities did not release the child's age or name, but said he was taken by ambulance to the hospital for further examination.
``He was crying; he was scared more than anything,'' fire Capt. Walter Myers told The Press of Atlantic City.
The ride was closed, but the rest of the park and its rides remained open Saturday night.
Police said the boy was thrown from his seat while riding. A witness told the newspaper that the child apparently tried to climb out of the front car as it approached a small hill.
The accident happened five years to the day after a fatal roller coaster accident at another Ocean City amusement park, Gillian's Wonderland Pier.
Kimberly Bailey, 39, and her 8-year-old daughter, Jessica, of Pomona, N.Y., were killed on the Wild Wonder when the car carrying them up a steep incline at the start of the ride suddenly plunged backward, rounding a curve and ejecting them.
Information from: The Press of Atlantic City
