Question

A stone is protected particaly upward from the ground with a speed of 20m/sec . How high dose it take? How much time dose it take?

Answer 1

time = 4 sec

h max = 400\2*10=20 m

Answer 2

Explanation:

initial velocity ,u=0

final velocity,v=20m/s

height,h=?

time,t=?

gravitational,g=9.8m/s square

according to third law

v square=u square +2gh

20×20=0×0+2×9.8×h

400=19.8h

h=400×10/198=20.2m

v=u+gt

20=0+9.8×t

t=20×10/98=2.04