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    				| 1. | A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speeHow long does the body take to stop ?16.d 15ms[2 Marks] | 
| Answer» The force exerts a deceleration on the body and it can be found by,F=ma50=20×aa=2.5ms^-2 The deceleration is2.5ms^-2 To find the time taken to stop the mass, we can use, v = u+at0=15-2.5tt=15/2.5t=6s Therefore, it would take 6 seconds to stop the mass | |