*PLEASE HELP ME* A tennis ball is hit with an initial velocity of 15 m/s at an angle of 40°. What is the horizontal distance of the ball after 2 seconds? (round to the nearest meter)

11th

Physics

Motion in a Plane

Projectile Motion

A tennis ball is hit with a...

PHYSICS

A tennis ball is hit with a vertical speed of 10m/s upwards and a horizontal speed of 30m/s. How far will the ball travel horizontally before landing?

MEDIUM

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ANSWER

Given,

v

0y

=10m/s

v

0x

=30m/s

g=10m/s

2

In projectile motion, for solving the total distance traveled by the ball horizontally, have to calculate the total time to cover going up and landing down by the given equation,

y=v

0y

t+

2

1

gt

2

+y

0

at the point where it lands, y=0

0=10t+

2

1

(−10)t

2

0=t(10−5t)

t=0,2sec

The total horizontal distance covered by the tennis ball is given by

x=v

0x

t

x=30×2

x=60m

The correct option is D.

Explanation:

Hope it is helpful

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg