On Planet X, you drop a 25.0kg stone from rest and measure its speed at various

Question

On Planet X, you drop a 25.0kg stone from rest and measure its speed at various times. Then you use the data you obtained to construct a graph (see the figure(Figure 1) ) of its speed v as a function of time t.

1-What is g on Planet X?

2-An astronaut drops a piece of equipment from rest out of the landing module, 3.50m above the surface of Planet X. How long will it take this equipment to reach the ground?

3- How fast will this equipment be moving when it reaches the ground?

4-How fast would an astronaut have to project an object straight upward to reach a height of 18.0m ?

5-How long would it take the object to reach a height of 18.0 m?

Explanation / Answer

g=dv/dt

that is slope of the curve=15m/s2

2)using s=ut+.5at2

t=0.68s

3)v=u+at

v=6.83m/s

4)no using v2=u2+2as

here v=0

s=18

so u=23.24m/s

5)v=u+at

t=2.323 s

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