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Author Question: The initial velocity of a projectile is 40m/s. The y component of the velocity is 50% of the initial velocity.? (Read 1275 times)

j_sun

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on: Jun 23, 2013
I am currently enrolled in an online Physical Science course and this is one of my homework problems; I have not been able to find the answer anywhere online or in the book. Please help!

The initial velocity of a projectile is 40m/s. The y component of the velocity is 50% of the initial velocity. What is the hang time for this projectile?

A.) 20s
B.) 4s
C.) 2s
D.) 10s

Thanks!


coco

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Reply #1 on: Jun 23, 2013
hello,

If your vertical component of velocity is 50% of 40 m/s then it is 20 m/s

And the vertical velocity at the peak is zero

v = u + at

v = zero

u = - at

t = - v/a

t = -20 m/s / 10 m/s^2

t = 2 sec.

But this is only the time to the peak, the total time of flight is double this

T = 2t = 4 sec

Good Luck


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