Saturday

July 26, 2014

July 26, 2014

Posted by **Jane** on Monday, October 19, 2009 at 11:16pm.

(assuming no other forces) is

x" = -g, where x(t) is the height of the object

above the ground, t is time, and g is the gravitational constant. Find a general

expression to describe the height of the object above the ground with respect

to time, t; i.e. find x(t).

(b) Suppose the object is dropped from a height of 100 units (so x'(0) = 0 and

x(0) = 100), how long will it take to hit the ground?

- Physics -
**bobpursley**, Tuesday, October 20, 2009 at 6:04amx"=-9.8

x'=INT (-9.8)=-9.8t+x'(0)

x= INT (-9.8t+x'(0))

= x'(0)*t-1/2 9.8t^2 + x(0)

b) given x(0)=100, x'(0)=0

x=-4.9t^2 if x=-100

then t= sqrt(100/4.9) when it hits the ground.

**Related Questions**

Physics - a) Newton's law of motion states that the acceleration acting on a ...

Physics - Only two horizontal forces act on a 9.1 kg body. One force is 5.3 N, ...

AP Physics - While two forces act on it, a particle is to move at the constant ...

Physics - Two colliding objects exert equal and opposite forces on each other (...

Physics - (10 points) 3. Use your data from Part 3 and Newton’s laws to explain...

physics - Two forces acting on a body in opposite directions,have the resultant ...

Newton' law of motion - A resultant force of 50N pulls a body of mass 10kg along...

physical - Only two horizontal forces act on a 3.0 kg body that can move over a ...

calc - Air resistance acting on a falling body can be taken into account by the ...

SCIENCE - For my science project i have to choose a sport and list five ...