Question

7. A man shot a bullet with a speed 10 m/s which just penetrates a plank of wood. With what
speed should he shoot a bullet to pass through 10 similar planks. 8. Find the initial velocity of a car which stops in 10 s after applying brakes and the retardation of
the car is 2.5 m/s2. 9. A body reaches ground in T when dropped from height “h”. What is the time taken by the body
if it dropped from height “2h”? 10. Brakes applied to a car product a uniform retardation of 90 cm/s. If the car was travelling with a
velocity of 27 m/s then what distance will it cover before coming to rest? 11. Between two stations a train accelerates uniformly at first, then moves with constant speed and finally retards uniformly. If the ratios of time taken are 1:8:1 and the greatest speed is 60 km/hr. find the average speed over the whole journey. 12. The speed of a satellite revolving in a circular orbit around mars is 1758 nkm/hr. It takes 32 hr to
complete one revolution. Calculate the radius of the orbit.

Answer 1

Answer:

please mark brilliant and thank please

Explanation:

Hey mate!

Here's your answer!!

Energy at 10m/sec = 100m/2 kgm²/s², energy reuired to pass through 10 planks is 1000 m/2 kgm²/s².

Mass remaining same,

v = √1000 = 10√10m/s.

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