Question

hailstones falling vertically with a speed of 10m/s hit the wind screen(wind screen makes an angle 30 degree with the horizontal) of a moving car and rebound elastically. find the velocity of the car if the driver finds the hailstones rebound vertically after striking

Answer 1

Answer on Question #44294-Physics-Mechanics-Kinematics-Dynamics

Hailstones falling vertically with a speed of $10\mathrm{m / s}$ hit the wind screen (wind screen makes an angle 30 degree with the horizontal) of a moving car and rebound elastically. Find the velocity of the car if the driver finds the hailstones rebound vertically after striking

Solution

$\bar{V}$ is the velocity of a hailstone relatively car.

$$\bar {V} = \bar {V} _ {C} + \bar {V} _ {H},$$

where $\bar{V}_C$ is the velocity of car relatively ground, $\bar{V}_H$ is the velocity of a hailstone relatively ground.

The velocity of the car is

$$V _ {C} = V _ {H} \cot 3 0 {}^ {\circ} = 1 0 \sqrt {3} \frac {m}{s}.$$

Answer: $10\sqrt{3}\frac{m}{s}$ .

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