Question

From the top of a tower 49.05 m, a stone is projected upwards with velocity of 19.62 m/s, find i) the time required for stone to reach the ground ii) the time required to reach maximum elevation iii) the maximum elevation iv) the velocity with which the stone strikes the ground.

Answer 1

X=19.62*t-1/2(10*tpow2)+49.05
a) put x=0
b) diffenciate x with respect to t and put dx/dt=0
c) take the time of the answer of b) and substitute in the equation of x
d)diffrenciate x wrt t then put dx/dt=v(take the time from solving a) ) now substitute t value