Question

During a demonstration of the gravitational force on falling objects to her class, Sarah drops an 11 lb. bowling ball from the top of the science building. Determine distance the ball has traveled after falling for 1.0 second, ignoring air resistance and given the gravitational acceleration of 9.8 m/sec2.
A) 4.9 m
B) 11 m
C) 20 m
D) 32 m

The center on a high school basketball team wants to increase the maximum height of his jump. What statement correctly describes how he could achieve this goal?
A) Wearing lighter shoes would increase the height of his jump.
B) Jumping at a 45° angle would increase the height of his jump.
C) Jumping with greater acceleration would increase the height of his jump.
D) Jumping with greater initial velocity would increase the height of his jump

Answer 1

1.

Answer: option A) 4.9 m

Explanation:

From the equation of motion,

s  = u t + 0.5 a t ²

Where, t is the time, a is the acceleration, u is the initial velocity and s is the displacement.

Here, the initial velocity of the bowling ball is zero. u = 0

The ball falls under gravity. Thus, a = g = 9.8 m/s²

Time = 1.0 s

Hence, s = 0 + 0.5 × 9.8 m/s² × (1.0 s)² = 4.9 m

Thus, the ball has traveled 4.9 m after falling for 1.0 second. Correct option is A.

2.

Answer: option D) Jumping with greater initial velocity would increase the height of his jump

Explanation:

The maximum height achieved by a jumper depends on the angle , the initial velocity and acceleration due to gravity.

For maximum height, angle of the jump should be 90 degrees. Hence, more the initial velocity more the height of the jump.

Thus, correct option is D.

Answer 2

1.A) 4.9 m  

AL2006 Ace

The instant it was dropped, the ball had zero speed.

After falling for 1 second, its speed was 9.8 m/s straight down (gravity).

Its AVERAGE speed for that 1 second was (1/2) (0 + 9.8) = 4.9 m/s.

Falling for 1 second at an average speed of 4.9 m/s, is covered 4.9 meters.

ANYTHING you drop does that, if air resistance doesn't hold it back.

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2 idk sorry