Answer:
Watermelon is going at a speed of 
in downward direction
Explanation:
Given
- Height of the Empire State building = 320 m
- Speed of the superman = 24 m/s
since both the motion of both watermelon and the superman is under gravity. The acceleration of both is g in downwards direction. So the relative acceleration between them is zero and when they meet the relative distance covered by them will be the height of the Empire State building.
so let t be the time when they meet given by
Now let v be the velocity of the the watermelon when they meet given by
Answer:
The mass will be "8.86 lb".
Explanation:
The given values are:
Force
= 70,000 mi/h
Speed
= 7900 mi/h
On applying the Law of momentum, we get
⇒ 
On putting the estimated values, we get
⇒ 
⇒ 
⇒ 
Probably cosine. The horizontal component in ratio to the total velocity would give the cosine.
The motion of the rock is a free-fall motion, which is a uniformly accelerated motion with constant acceleration 
downward, so the distance covered by the rock in a time t can be found by using the formula
By substituting t=3 s into the formula, we find the distance the rock travels after falling for 3 seconds:
Answer:
Positive z direction.
Explanation:
The magnetic force acting on the electron is given by the formula as :
q is the charge on proton
v is the speed of proton
B is the magnetic field
It is mentioned that the proton is moving with a velocity in the positive x-direction. The uniform magnetic field B in the positive y-direction such taht,
q = +e
v = vi
B = Bj
Since, 
So, the magnetic force acting on the proton in positive z axis. Hence, the correct option is (d) "positive z direction".
