2015 · Q43
A brick is thrown vertically from an aircraft flying two kilometres above the earth. The brick will fall with a
General KnowledgePhysics
- Aconstant speed
- Bconstant velocity
- Cconstant acceleration
- Dconstant speed for some time then with constant acceleration as it nears the earth
Explanation
Ignoring air resistance, the only force on the brick is gravity, so it falls with the constant acceleration g (about 9.8 m/s2) — its speed and velocity both keep increasing, and there is no initial constant-speed phase. Hence C.