A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 m s^(-1) . How long does the body take to stop ?

A constant retarding force of 50 N is applied to a body of mass 20 kg

1.	A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 m s^(-1) . How long does the body take to stop ?
Answer» Solution :RETARDING forceF= - 50 N Mass m= 20 kg Finalvelocityv= 0 ByNewtonsecondlaw of motion `:.A = (F )/( m ) =(-50)/(20)-2.5m//s^(2)` Accordingto equationof motion `V= v_(0)+ at ` `0=15+ (-2.5)t` `t= (15)/( 2.5)=6s`