An object is thrown vertically upwards with an initial velocity of 20m/s from the edge of a cliff that is 30m from the sea below, as shown in figure 12.2 Determine:
A. Ball’s maximum height
B. Time taken for the ball to reach its maximum height
C. The Time to hit the sea
D. The speed with which it hits the sea
(You May approximate g by 10m/s)

radiation warms things up temp rises convection currents air circ windy weather

the answer for apex is the lowest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

the right answer is 0.3 meters per second