Problem 81.

An object travels a distance of 5 km towards east, then 4 km towards north and finally 10 km towards east

1) what is total traveled distance?

2) what is resultant displacement?

Solution

Problem 82.

Can two displacements (vectors) of different magnitudes be combined to give a zero displacement (resultant)?

Solution

Problem 83.

What is the speed (m/sec) needed for a stunt driver to launch from a 20 degree ramp to land 15 m away?

What is his maximum height?

Solution

Problem 84.

A body moves 4 km towards East from a fixed point A and reaches point B. Then it covers 5 km towards North and arrives at point C. Find the distance and directions of the net displacement.

Solution

Problem 85.

A baseball player hits a homerun, and the ball lands in the left field seats, which is 120 m away from the point at which the ball was hit. The ball lands with a velocity of 20 m/s at an angle of 30 degrees below horizontal. Ignoring air resistance

(A) find the initial velocity and the angle above horizontal with which the ball leaves the bat;

(B) find the height of the ball relatively to the ground.

Solution

Problem 86.

A body covers 1/4 journey with a speed of 40 km/h, 1/2 of it with 50 km/h and remaining with the speed of 60 km/h. Calculate average speed for entire journey.

Solution

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