Assertion : Two bodies of masses M and m(M>m) are allowed to fall from the same height if the air resistance for each be the same then both the bodies will reach the earth simultaneously. Reason : For same air resistance, acceleration of both the bodies will be same.

Step-by-step solution

The force acting on the body of mass M are its weight M g acting vertically downwards and air resistance F acting vertically upward. Acceleration of the body a= M g-F M =g- F M Now, M>m , therefore, the body with larger mass will have greater acceleration and it will reach the ground first.