I got 6.36 rad but it’s wrong. So can someone help?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero