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# M1 Help! watch

1. a ball is thrown vertically upward from ground level with an initial velocity of 96 feet per second.
a) how long will it take to rise to the maximun height?
b)what is the maxium height?
c)when is the velocity of the ball one-half the initial velocity
d)what is the height of the ball when its velocity is one-halfthe inithal velocity
2. (Original post by superkillball)
a ball is thrown vertically upward from ground level with an initial velocity of 96 feet per second.
a) how long will it take to rise to the maximun height?
b)what is the maxium height?
c)when is the velocity of the ball one-half the initial velocity
d)what is the height of the ball when its velocity is one-halfthe inithal velocity
Do you know the SUVAT equations?
3. (Original post by superkillball)
a ball is thrown vertically upward from ground level with an initial velocity of 96 feet per second.
a) how long will it take to rise to the maximun height?
b)what is the maxium height?
c)when is the velocity of the ball one-half the initial velocity
d)what is the height of the ball when its velocity is one-halfthe inithal velocity

what is the value of g in feet per second^2?
i would had answered it if it was in ms^-2.
4. (Original post by superkillball)
a ball is thrown vertically upward from ground level with an initial velocity of 96 feet per second.
a) how long will it take to rise to the maximun height?
b)what is the maxium height?
c)when is the velocity of the ball one-half the initial velocity
d)what is the height of the ball when its velocity is one-halfthe inithal velocity
Firstly convert to ms^-1
96 ft/s = (0.3048*96)ms^-1 = 29.2608ms^-1

a) Taking up as positive.
u = 29.2608
v = 0 (at maximum height)
a = -9.8
t = ?

v = u + at
0 = 29.2608 - 9.8t
t = 29.2608/9.8 = 2.99 seconds

b) Taking up as positive.
s = ?
u = 29.2608
v = 0 (at maximum height)
a = -9.8

v^2 = u^2 + 2as
0 = (29.2608)^2 - 19.6s
s = ((29.2608)^2)/19.6 = 43.7m

c) Taking up as positive.
u = 29.2608
v = 0.5*29.2608 = 14.6304
a = -9.8
t = ?

v = u + at
14.6304 = 29.2608 - 9.8t
(14.6304 - 29.2608)/(-9.8) = t = 1.49 seconds

d) Taking up as positive.
v = 14.6304
u = 29.2608
s = ?
a = -9.8

v^2 = u^2 + 2as
(14.6304)^2 = (29.2608)^2 - 19.6s
s = 32.8m

All answers to 3sf.

Widowmaker.
5. (Original post by Widowmaker)
Firstly convert to ms^-1
96 ft/s = (0.3048*96)ms^-1 = 29.2608ms^-1

good one! converting into ms^-1 instead of using ft all the time, didnt think of that ! good one!
6. (Original post by yazan_l)
good one! converting into ms^-1 instead of using ft all the time, didnt think of that ! good one!
thanks for the rep but you need more rep points/posts for it to count.
7. (Original post by Widowmaker)
thanks for the rep but you need more rep points/posts for it to count.
well at least it shows that i liked ur way!
i think we shouldnt be talking about such things here! they will give us ( at least me ) neg. rep! and i dont need that!

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