stone is thrown outward, at an angle of 30° with the horizontal into the river from a cliff, that is 75 meters above the water level at a velocity of 54 km/hr. How long it will take the stone to hit the surface of the river?

The average speed of a car in km/hr that drives a distance of 20 km in a time of 15 minutes is? a. 80 km/hr b. 20 km/hr c. 15 km/hr d. 10 km/hr

Please explain and give the final answer for this problem. I keep getting wrong answers after calculations.

A volcano ejects a chunk of rock straight up at a velocity of vy = 30 m/s. Ignoring air resistance, what will be the velocity vy of the rock when itfalls back into the volcano’s crater?A. > 30 m/s            B. 30 m/s          C. 0 m/s         D. -30 m/s        E. < -30 m/s

D. 56 20. A ball is thrown vertically upward at 20 m/s from a height of 30 m above the ground. What is its speed on impact with the ground below? A. 14 m/s B. 24 m/s (C.) 31 m/s D. 44 m/s

3. Aball is thrown vertically upward with a speed of 15.0 m/s frorn the edge of a 20.0 m tall building. The ball hits the ground 4: loter. Calculate the overage volocity (in m/s) of the ball. V,= 15 m/s 20 m ground

When a nurse squeezes a syringe vertically up, the liquid squirtss 3.43 cm into the air With what speed does the liquid emerges from the syringe?   CHOICES   A. 0.82 cm/s B. 82 cm/s C. 820 cm/s D. 82.52 cm/s

If you throw a ball with an initial horizontal velocity of 20 m/s and an initial vertical velocity of 40 m/s. a. What will be the vertical displacement after 3 seconds? b. What will be the horizontal displacement after 3 seconds? c. What will be the vertical velocity after 3 seconds? d. What will be the horizontal velocity after 3 seconds?

A physics student measures the depth of a deep hole by dropping a rock into the hole. The rock takes 5 seconds to hit the bottom. Assuming g = 10 m/s2, the depth of the hole is approximately: %3D A. 25 meters B. 50 meters C. 100 meters D. 125 meters E. 200 meters

A hot-air balloon is traveling vertically upward at a constant speed of 5.0 m/s. When the balloon is 21 m above ground, a package is released from the balloon which eventually hits the ground directly below the balloon. Calculate the following: a. The time the package spends in the air. b. The speed of the package right before it hits the ground. c. The height of the balloon at the moment the package hits the ground.