In an experiment a student observed the magnification produced by three mirrors A, B and C. It is found that A produces constant magnitude of magnification with same sign always while B produces magnifications of different magnitudes and sign depending on the position of the object. Mirror C produces magnifications of different magnitudes depending on the position of the object with same sign always. The mirror A, B and C respectively a) plane mirror, concave mirror, convex mirror
b) plane mirror, concave mirror, plane mirror
c) convex mirror, plane mirror, concave mirror
d)concave mirror, convex mirror, plane mirror

After the near spacecraft passed mathilde, on several occasions rocket propellant was expelled to adjust the spacecraft's momentum in order to follow a path that would approach the asteroid eros, the final destination for the mission. after getting close to eros, further small adjustments made the momentum just right to give a circular orbit of radius 45 km (45 × 10^3 m) around the asteroid. so much propellant had been used that the final mass of the spacecraft while in circular orbit around eros was only 545 kg. the spacecraft took 1.04 days to make one complete circular orbit around eros. calculate what the mass of eros must be.

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?