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Answer:
10) when we throw a ball up in the sky the acceleration due to gravity becomes negative.
As the force is acting opposite to the force of gravity
12) Given,
time taken=0.5s
g=10ms−2
As the car is under free fall, the initial speed is zero.
(a) Under free fall,
u=0
a=g
v=u+at
v=0+10×0.5
v=5ms−1
(b) Average speed = 2u+v=20+5=2.5ms−1
(c) From newton's equation of motion, As u=0,
h=ut+21gt2
When h is the height, t is the time of free fall, g is the acceleration due to gravity. Putting the values in the above equation, we get
h=21×10×(0.5)2=5×0.25=1.25m
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