Assessment: Motion in a Plane

Why does a projectile follow a curved (parabolic) path instead of a straight line?

An object moves at a constant 10 m/s around a circle. Is it accelerating?

A velocity of 30 m/s acts at 40° above the horizontal (cos40° ≈ 0.766). Find its horizontal component.

A 2 kg object moves in a circle of radius 4 m at 8 m/s. Find the centripetal force required.

A ball is launched at 18 m/s at 50° above horizontal (sin50° ≈ 0.766). Find its time of flight (g = 9.8 m/s²).

Two projectiles are launched at the same speed, one at 30° and one at 60°. How do their ranges compare?

What provides the centripetal force that keeps the Moon in orbit around Earth?

Why do long jumpers typically launch at an angle noticeably less than 45°, even though 45° maximises range for a projectile?

If a projectile's launch speed is doubled (angle unchanged), what happens to its maximum height?