posted by .

World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15m/s^2 .
Part a)How much horizontal force F must a sprinter of mass 60kg exert on the starting blocks to produce this acceleration? express your answer in newtons
Part b)
Which body exerts the force that propels the sprinter, the blocks or the sprinter?

question # 2: net force of 225 N accelerates a bike and rider at 2.65m/s^2. What is the mass of the bike and rider together ?

Thank you .

A : F=ma
B : m= F/a

## Similar Questions

1. ### Physics

ok so I have a question At the instatn a race began, a 57-kg sprinter was found to exert a force of 80 N on the starting lbock at 22 degrees with respect to the ground what was the horizontal acceleration of the sprinter?
2. ### Physics

A particular sprinter reaches a horizontal acceleration of 13.3 m/s2 out of the starting block. The starting block is tilted such that the vertical component of the force which the starting block exerts on the sprinter compensates …
3. ### physics

A block of mass 4.0 kg is put on top of a block of mass M = 6.0 kg. To cause the top block to slip on the bottom one, while the bottom one is held fixed, a horizontal force of at least 19 N must be applied to the top block. The assembly …
4. ### physics

Three blocks are in contact with each other on a frictionless horizontal surface. A 696 N horizontal force is applied to the block with mass of 4.7 kg as shown in the ﬁgure below. The acceleration of gravity is 9.8 m/s 2 . 4.7 …
5. ### physics

At the instant a race began, a 74.0 kg sprinter exerted a force of 850 N on the starting block at a 23.0 degree angle with respect to the ground. what was the horizontal acceleration of the sprinter?
6. ### Physics

A 77 kg sprinter is running the 100 m dash. At one instant, early in the race, his acceleration is 4.7 m/s^2. a) What total force does the track surface exert on the sprinter?
7. ### Physics

At the instant a race began, a 89.1 kg sprinter exerted a force of 710 N on the starting block in the direction 110 degrees measured clockwise from the positive x-axis. (a) What was the horizontal acceleration of the sprinter?
8. ### Physics

Please help! A young girl with mass 42.5kg is sliding on a horizontal, frictionless surface with an initial momentum that is due east and that has magnitude 94.0kg * (m/s) . Starting at 0s , a net force with magnitude F=( 8.10N/s )*t …
9. ### Physics

A young girl with mass 39.5 kg is sliding on a horizontal, frictionless surface with an initial momentum that is due east and that has magnitude 85.5 kg⋅m/s . Starting at 0 s , a net force with magnitude F=( 8.35 N/s )t and direction …
10. ### Physics

A 67.5 kg sprinter exerts a force of 775 N on the starting block which makes a 20 degree angle to the ground. a) What was the horizontal acceleration of the sprinter?

More Similar Questions