NUST NET Physics · Physics · Mechanics. The idea in plain words, the rules to remember, the mistake to avoid and a worked example, written and checked by Mega Lecture.
For motion in a straight line with constant acceleration, four equations link u, v, a, s and t. Pick the one that leaves out the quantity you do not know or need. On a velocity-time graph the gradient is the acceleration and the area underneath is the displacement.
Newton's second law says force is the rate of change of momentum, so a force acting for a time gives an impulse equal to the change in momentum. Total momentum is conserved in every collision; kinetic energy is conserved only in an elastic one.
A projectile is two motions at once: constant velocity horizontally (u cos θ) and free fall vertically (starting at u sin θ).
Saying a projectile has zero velocity at its highest point. Only the vertical part is zero there; the speed is still u cos θ and the acceleration is still g downwards.
Answer: 30 m
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