Simple, A. None of the other answers make sense so, A.
Answer:
Height of cliff = S = 20 m (Approx)
Explanation:
Given:
Initial velocity = 8 m/s
Distance s = 16 m
Starting acceleration (a) = 0
Computation:
s = ut + 1/2a(t)²
16 = 8t
t = 2 sec
Height of cliff = S
Gravitational acceleration = 10 m/s
S = 1/2a(t)²
S = 1/2(10)(2)²
Height of cliff = S = 20 m (Approx)
It is D) raising a 200 kg box to a height of 2 m using an inclined plane of length 8 mI think .
<em>Acceleration is defined as change in velocity divided by time duration.</em>
<em>70 kmph = 70 * 1000 meter / 3600 sec = 175/9 meter / sec</em>
<em>Acceleration = [ 175/9 - 0 ] m/sec / 7 sec</em>
<em> = 175 / (9 * 7) = 25/9 </em>m/sec²
<em> = 2.77 meters/ sec²</em>