A RADAR signal is beamed towards a planet and its echo is received 7 minutes later. If the distance between the planet and the Earth is 6.3 x 1010 m. Calculate the speed of the signal?
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u=0
d=6.3×1010m
t=420 s
v=?
a=?
s=ut+1/2at²
6.3×1010=0.420+1/2a(420)²
6363=88000a
a=6363/88000
a=0.072
therefore acceleration=0.072m/s²
v=u+at
=0+0.072×6363
=458.1 m/s
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