9. A body starts from rest with constant acceleration and gains the velocity 25 m s-1 in first 10 s. How much is the distance moved by the body? What is its velocity at the end of 7 s? [125 m, 17.5 ms-11 10. A bullet fired with speed 100 m - travels 500 m in air. Assuming the air friction to be constant, calculate the retardation produced by the air. What is the time of its flight? How much is the velocity of bullet after 1.2 s of motion? [10 ms 2, 10s, 488 ms-11
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Answer:
ans 9 is s = 125 m and velocity after 7s is 17.5 m/s
Explanation:
9.
Given
u = 0
v = 25 m/s
t = 10s
a = v- u / t
a = 25-0/10
a = 2.5 m/s²
s = ut + 1/2 at²
s = 0×10+1/2×2.5×10²
s = 125 m
v if t is 7s
v = u + at
v= 0+2.5 × 7
v= 17.5 m/s
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