A school building is 42 m long and 20 m high. A
student throws a cricket ball, from a point x m away
from the base of building as shown in the figure. The
ball just clears the front and back tops of the
building. If the time of flight is 5 s, then the value of
x is (g =-10 m/s)
B
20 m
0
X
42 m
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