Under uniform acceleration,v=u+at, where v is final velocity, u is initial velocity, a is acceleration and t is time.
Here,v= -25 m/s,u=35 m/s,a=-1.62 m/s2 (upward direction has been chosen as the positive direction).
So,-25=35+(-1.62)*t
=> t=(-25-35)/(-1.62)=37 s (fifth option).
A rock is projected upward from the surface of the Moon, at time t = 0...
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a. An attacker at the base of a castle wall 3.65 m high throws a rock straight up with speed 7.40 m/s from a height of 1.55 m above the ground. Will the rock reach the top of the wall? If so, how fast is it moving when it reaches the top. If not, what initial speed must it have to reach the top? b. To defend the castle, a rock is thrown downwards from the top of the wall with...
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