A projectile launched over level ground reaches its maximum height in 10 seconds

Question

A projectile launched over level ground reaches its maximum height in 10 seconds. Approximately what was the range of the projectile if it was launched with a speed of 200 m/s? 1700 m 2000 m 3400 m 4000 m Two objects are dropped from a height of 100 m. If one object is heavier than the other object, which of the following is time? The heavier object will experience equal force and accelerate more slowly. The heavier object will experience more force and accelerate more quickly. The heavier object will experience equal force and accelerate at the same rate. The heavier object will experience more force and accelerate at the same rate. Two balls with exactly the same size and shape are launched with the same initial velocity from the surface of a perfectly flat plane. When air resistance is considered, the ball with the greater mass will have a: longer flight time and a greater maximum height. longer flight time and a lower maximum height shorter flight time and a greater maximum height. shorter flight time and a lower maximum height

Explanation / Answer

121 ) using v = uy + at

0 = u - 9.8x10

uy = 98 m/s

ux = sqrt(u^2 - uy^2)

   = 174.3 m/s

total time will double of max. height = 20 sec

R = ux *t

= 3487 m (Option C)

122) (Option D) The heavier object will experience more force and accelerate at the same rate.

Force experienced by the object is F=mg

       Mass is more for heavier object and hence more force , acceleration is same that is g

because g is same and force mg depends upon mass.

123) (Option A) longer fligt time and a greater maximum height

The heavier ball is less affected by air resistance therefore it can "power" its way through the air molecules more effectively achieving a greater height and because we achieve a greater height it will be in the air longer.

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