Sampath Maru (74) was knocked by a Honda car being driven by 17-year-old Yash Bora (17) near Samrat hotel, police said adding that the teenager was heading towards K C College along with his friend accompanying him in the car.
According to police, Bora, a student of Jai Hind college, was driving the vehicle at 80 kmph speed and lost control of it and hit Maru, who was on a morning walk.
Shocked after the incident, Bora suddenly pressed accelerator instead of the break, hitting other vehicles and two constables, who were on way to attend their duty.
While one constable was discharged with minor injuries, another constable, identified as Yogesh Najia, was admitted to Bombay hospital.
The car has been seized and the boy has been booked for rash and negligent driving, police said adding that he will be subjected to a medical test to ascertain if he was under the influence of alcohol at the time of the incident.