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1) A bullet blasts from the barrel of a gun upward in the vertical direction with an initial speed of 700 m/s. Find the maximum altitude reached by this bullet and the time needed to reach it.
ReplyDeleteInitial speed u = 700 m/s Final speed v =0m/s (at the maximum altitude) , a = 10m/s2
t = ( vu)/0 =( 0 – 700)/10 = 70m/s
v2 = u2 + 2as
v2  u2)/ 2a =s
0 – (700)2 /2x10
=  490000/20 = 24500m
2) A mouse is dropped from an eagle's claws starting at an altitude of 150 meters. What distance does it fall in the third second after it is dropped?
S = ut + ½ at2
0x3 + ½ x 10 x3x3
= 45m
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