Please answer the 77 and 78
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Given u=50m/s
v=o
t=20s
a=v-u/t
a=o-50/20
a=-2.5m/s^2
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Answer:
Step-by-step explanation:
77.) Since it is moving with a speed of 50m/s, u=50m/s
As it comes to rest, v= 0m/s
Time= 20sec
Acceleration =v-u/t
= 0-50/20
=-50/20
= -2.5m/s square( deccelaration)
Option D
78.) Mass = 0.3 kg
Height = 9 m
g= 10 m/s square
Potential energy = mgh
= 0.3×9×10
= 3×9
=27j
Option A
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