A large carrdboard box of mass 0.75kg is pushed across a horizontal floor by a force of 4.5N the motion of the box is opposed by i) frictional force of 1.5N between the box and the floor and ii) an air resistance force kv^2 6.0*10^-2kg/m and v is the speed of the box in metres .sketch a diagram showing the directions of the forces acting on the moving box. calculate the minimum values for a) the acceleration of the box b) the speed of the box

the answer would be c. motion and direction

i hope this : )

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min