Q4 you A bird begins to accelerate at a constant 0.3 m/s for 3 s. Its change in velocity is
A. 0.9 m/s B. 1.5 m/s C. 1.95 m/s D.2.4 m/s

• From first newtons equation of linear motion:

• from that equation, let's get the relation for the change in velocity;

• a is the acceleration, a = 0.3 m/s and t is time, t = 3s

Answer: A. 0.9 m/s

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft

it is b. absorbs thermal energy