Physics - please answer these questions. Thank you.

A 100 kg box sits on a truck that is accelerating at 2 mfs"2. If the box does * 1 point not slip back, despite being accelerated by the truck, what is the magnitude of the force of friction on the box? A net force of 25 Newtons is applied horizontally to a 10 kg block resting on * 1 point a table. What is the magnitude of acceleration of the block? 0.4 m/S12 O 2.5 m/s^2 O 0.0 m/S^2 O 0.26 m/s^2The diagram below shows a force of magnitude F applied to a mass at * t polo". angle theta relative to a horizontal friotionless surface. As angle theta is increased, the horizontal acceleration of the mass: HORIZONTAL FRICTIONLESS SURFACE 0 remains the same 0 increases 0 decreases lithe mess of the hex is 12 kg, theta is 30 degrees and the force F is 25 N, * i poi-T. what is the normal force