Question

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A particle moving with a velocity of 4 m/s along x-axis accelerates at a constants rate of 1.5 m/s^2 along y-axis. The speed of the particle after 2 seconds is 4 m/s 5 m/s 1.5 m/s 2 m/s 3 m/s A bullet shot horizontally from a gun: strikes the ground much later than one dropped vertically from the same point at instant travels in a straight line Is brought to rest by air resistance alone strikes the ground at approximately the same time as one dropped vertically from the same point at the same instant strikes the ground much sooner than one dropped from the same point at the same instant To go over a 3-m high fence, a fox jumps at 10 m/s at 45 degree with the horizontal level ground, from a horizontal distance of 6 m from the fence. Which one of the following statements is true. The fox goes over the fence because the maximum height it attained is more than the height of the fence. The fox could not go over the fence even though it could attain the maximum height. The fox could not go over the fence because it hit the fence before attaining the maximum height. The fox could not go over the fence because it hit the ground before reaching the fence None of the above statements is true. A small ball is thrown horizontally from the edge of a cliff that is 2.45 m high. It strikes the floor at a point 4.9 m horizontally from the diff edge. The ball was in the air for. 2 s 0.5 s 0.7 s 1s 1.41 s

Answer 1

4.

consider the motiomn in vertical direction

Y = vertical displacement = height = 2.45 m

V_o = initial velocity = 0 m/s

a = acceleration = 9.8

t = time taken

using the equation

Y = V_o t + (0.5) a t²

2.45 = 0 t + (0.5) (9.8) t²

t = 0.7 sec