A lunar lander is descending toward the moon\'s surface. Until the lander reache

Question

A lunar lander is descending toward the moon's surface. Until the lander reaches the surface, its height above the surface of the moon is given by y (t) = b - ct + dt2, where b = 730 m is the initial height of the lander above the surface, c = 60.0 m/s, and d = 1.00 m/s2. What is the initial velocity of the lander, at t = 0? What is the velocity of the lander just before it reaches the lunar surface? Small Sample Moan Problem. A study was done to determine the effect of vitamin supplements on the birth weight of babies. The data below show the summary statistics and a stem and leaf plot of the birth weight of 16 babies. Weight is in kilograms(kg). A small sample mean problem needs to be able to assume the distribution of the data is approximately normal. Is this reasonable for this data and why? in kg, stem is whole number 2.54 is 2.54

Explanation / Answer

at t = 0
velocity v= y' = -c + 2dt

at t= 0 v = -c = -60 m/s

 

for lunar surface

y= 0

so t2 - 60 t +730= 0

 

hence t = 16.96 sec

when it first time reach there 

velocity = -60 + 2*1*16.96 = -26.08 m/s

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