Projectiles

A stunt man drives a car off a 10m high cliff at a speed of 20.0m/s. How far does the car land from the base of the cliff?

• 28.6 m

• 32.2 m

• 19.5 m

• 52.9 m

Tags

NGSS.HS-PS2-4

A gray kangaroo can bound across level ground with each jump carrying it 10 m from the takeoff point. Typically the kangaroo leaves the ground at a 20^o. If this is so, what is its takeoff speed?

• 6 m/s

• 12 m/s

• 24 m/s

• 20 m/s

Tags

NGSS.HS-PS2-1

A gray kangaroo can bound across level ground with each jump carrying it 10 m from the takeoff point. Typically the kangaroo leaves the ground at a 20^o angle. If this is so, what is its maximum height above ground?

• 0.6 m

• 1.5 m

• 2.0 m

• 0.9 m

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A ceiling fan spinning at 60 rpm coasts to a stop 25s after being turned off. How many revolutions does it make while stopping?

• 8 rev

• 16 rev

• 23 rev

• 13 rev

A projectile is launched with speed v₀ and angle θ. Derive an expression for the projectile's maximum height h.

• h= -(v₀²cos²θ)/2g

• h= (v₀²sin²θ )/2g

• h= (v₀²cos²θ)/2g

• h= -(vo²sin²θ )/2g

A projectile is launched with speed v₀ and angle θ. Using the equation derived for height h, a baseball is hit with a speed of 33.6m/s. Calculate its height if the baseball is hit at an angle of 30^o.

• 23.2 m

• 14.4 m

• 45.6 m

• 19.5 m