The Total solution for NCERT class 6-12
Two persons manage to push a motorcar of mass 1200 kg at a uniformvelocity along a level road. The same motorcar can be pushed by three personsto produce an acceleration of 0.2 m s-2. With what force does eachperson push the motorcar? (Assume that all persons push the motorcar with thesame muscular effort)
Given, mass of the car(m) = 1200kg
When the third personstarts pushing the car, the acceleration (a) is 0.2ms-2. Therefore,the force applied by the third person (F = ma) is given by:
F = 1200kg × 0.2 ms-2 =240N
The force applied bythe third person on the car is 240 N. Since all 3 people push with the samemuscular effort, the force applied by each person on the car is 240 N.