Arock is thrown vertically upward from ground level at time 0. at time t1 it passes the top of a tall tower, and later, at time t2, it reaches its maximum height. what is the height of the tower? give your answer in terms of the given variables and g.

h = g t₂ t₁ - t₁²

Explanation:

given,

At t = 0 s the rock is at ground level

At t = t₁ rock reaches at the height of the tower

Assuming height of tower be h

At t = t₂ rock is at the highest point.                        

distance of the tower = speed × time

at the highest point velocity is zero

using the kinematic equation

v = u +a t                                            

h = g t₂ t₁ - t₁²

grav potential energy

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.