Homework Help: Physics

Posted by Brandon on Tuesday, October 14, 2008 at 8:21pm.

A 5.0 104 kg space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.5 105 N over a distance of 2600 km. What is the final speed of the probe?

Physics - Damon, Tuesday, October 14, 2008 at 8:41pm
calculate initial Kinetic energy
Ke = (1/2) m v^2 Joules

calculate work done by force
W = 4.5 *10^5 * 2600 * 10^3 Joules

New Ke = original Ke - W

1/2) m Vfinal^2 = New Ke
- Physics - Brandon, Tuesday, October 14, 2008 at 9:31pm
  I continue to plug in 1.855 x 10^12 as the answer into my online hw and it rejected the answer. Is that correct?

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